Call of the Night begins with a 14-year-old Yamori, who becomes increasingly depressed after rejecting a classmate’s love confession. He starts wandering the streets at night because he can’t sleep. He meets a beautiful girl named Nazuna, who recognizes his nighttime restlessness as a lack of life satisfaction and decides to assist him in regaining it. She insists on sharing a bed when she takes him to her apartment to sleep. Yamori, who is nervous, pretends to be deep asleep. Nazuna transforms into a vampire and sucks his blood, finding him unusually tasty.
Yamori confronts her, but she assures him that he will not become a vampire because the only way a human can become a vampire is to fall in love with a vampire and then be bitten by that vampire. This confession makes her feel embarrassed, so she drinks a beer. Yamori is relieved, but then again disappointed. Unable to face returning to normal life and believing he has finally found something that excites him, he requests more time with Nazuna in the hopes of falling in love and becoming a vampire as well. Despite her reservations, Nazuna agrees to spend more nights together in exchange for his blood, and if he falls in love with her, so be it.
Nazuna embarrasses Yamori yet again when she explains that her blood drinking is essentially the same as having sex. Yamori, on the other hand, reiterates his desire to become a vampire. He then humiliates Nazuna by offering some of his blood. Yamori becomes envious the next night after learning from Nazuna that she does drink blood from random people.
As a result, he offers to exchange contact information, but she declines because she does not have a phone. She does, however, take him to her apartment and shows him her vintage brick phone. She then prepares for sleep and invites a nervous Yamori to join her. He initially refuses to let her drink his blood, but he lets her after she admits that she had actually been looking for him that night.
He gives Nazuna a wrist receiver the next night so she can communicate with him, who has the transmitter. Yamori then tells her from a distance that they are acting like a couple, which embarrasses her. He addresses her as “Nazunachan” on his school’s rooftop and formally asks her to be his friend. Later that night, as he wonders where Nazuna is, the other transmitter in his wrist receives a signal, just as another girl with the other receiver in her wrist appears beside him.
Akira Asai informs Yamori that she waited for him to contact her but that he never did. Nonetheless, she expresses her delight at seeing him. Yamori then recalls how Akira became his friend. Nazuna teases him the next day about leaving to see another girl, but his reaction confirms her suspicion.
Yamori meets with Akira after leaving, but Nazuna appears and teases them. When Nazuna drinks his blood in front of Akira, she proves that their relationship is purely physical. Yammer tells Akira in a café that he allows Nazuna to drink his blood because he is dissatisfied with school. She expresses her feelings and invites him to return to school with her. After Nazuna introduces herself, both she and Yamori leave.
After Yamori asks Nazuna if she is angry, she leaves upset. Yamori trips on some stairs and then calls Nazuna, apologizing for seeing Akira in secret. However, Nazuna appears and tells him that she was worried they would see each other less if he returned to school. Yamori tells her that he was unable to tell Akira that he cannot return to school due to his dream. A relieved Nazuna then drinks from the wound in his mouth, before jumping away, leaving him speechless.
While he ponders about what happened previously, and after witnessing a couple kissing nearby, Yamori assumes that he has already fallen in love with Nazuna. After she finds him, Yamori eagerly lets her drink his blood, but after he does not transform, Nazuna explains that he is confusing love with lust. After they both reveal it was their first kiss, Nazuna believes kissing is something friends do. The next night, Yamori invites Akira to hang out at Nazuna’s apartment. There, they play video games, and Nazuna offers kisses to whoever can beat her.
A frustrated Akira learns of Nazuna and Yamori’s kiss and tries to talk him out of falling in love with a vampire. Nazuna, on the other hand, explains that Yamori does not yet like her. They fall asleep after playing a dating sim, despite Akira’s discomfort with all of them sleeping in the same bed. Yamori finally tells Akira about how he will become a vampire if he falls in love with Nazuna after Nazuna explains their mutually beneficial relationship. After Nazuna falls asleep, Akira tells Yamori that they can still be friends even if he turns into a vampire and that she will not give up trying to get him to return to school.
Nazuna eventually finds herself in a bathhouse, where she instructs the clerk to notify her if her wrist receiver begins to beep. When it does, she rushes out of the bath, meeting Yamori outside in nothing but a long jacket. Yamori begins to feel different after taking a bath due to Nazuna’s new look, which she teases him about. They decide to rest after she drinks his blood, but Yamori is unaware that they have entered a love hotel. There, Nazuna explains that she can tell what someone is thinking based on the taste of their blood, and she teases Yamori’s emotions to get more taste.
After leaving, Yamori gets jealous when Nazuna spots a person from which she has drank blood before, but she says he is the only one at the moment. They then head to her apartment, where Nazuna reveals she runs a home massage parlor. She massages Yamori free of charge, but focuses on the more relaxing pressure points of his body, before trying to drink his blood. However, they are interrupted by the arrival of a client. Yamori is forced to greet her, and after he finds Nazuna playing in her room, she promises to give him a kiss as a reward for attending her in her place.
Kiyosumi Shirakawa recalls the first night she took Nazuna’s massage services. Back in the present, Yamori undertakes her massage. After learning his age, Kiyosumi asks him his motivations, and he explains he got fed up with school and just wants to enjoy his nights. Kiyosumi then suddenly realizes how she is genuinely unhappy at her work and breaks down crying.
A worried Yamori then refuses to let her answer a phone call from her boss, and to give her the thrill of a near-death experience, he has Nazuna throw her out her window, saving her just in time. Yamori apologizes for scaring Kiyosumi and reveals his and Nazuna’s secret, saying he wants to become a vampire. He then leads her down the middle of the street, giving her a sense of freedom. She expresses gratitude to Yamori for relieving some of her stress and encourages him to achieve his goals.
However, Yamori tells her he will turn her into a vampire as well, delighting Kiyosumi, and embarrassing Nazuna. Sometime later, they attend a night pool resort, where Yamori angrily pulls Nazuna away from two guys hitting on her. Sensing his jealousy, Nazuna flies him to another pool, where they enjoy themselves and she drinks his blood.
After running into Kiyosumi, Yamori is approached by a blonde, slender woman, who flirtatiously talks and teases him. After she tells him she is bored with her recent life, Yamori tries to console her by saying they are the same. She then jumps and embraces him, ready to suck his blood. However, Nazuna saves him just in time, as she explains she should just drink all of his blood and kill him.
However, another vampire kidnaps him and takes him to a building with three other vampires. They introduce themselves as Nico Hirata, Midori Kohakobe, Hatsuka Suzushiro, and Kabura Honda, and Nico tells him that his choice will make him fall in love and convert him. He, on the other hand, rejects all of their advances in favor of Nazuna. Meanwhile, Seri Kiky, the blonde vampire, tells Nazuna to stop playing with Yamori if she doesn’t want to mate with him, but she says she does, shocking her.
Yamori keeps spurning the vampires, finally yelling that it will be Nazuna who conquers him, just as she arrives. Seeing her newfound interest to leave descendants, the girls accept Yamori, who says he will fall in love with Nazuna, no matter how long it takes.
The vampires explain to Yamori that a human has exactly one year to become a vampire after they first get their blood sucked. Nazuna brushes it off and repays Yamori the kiss he was promised. Yamori briefs Akira about his predicament, and she explains that he will probably be killed after the year passes.
Back home, Akira runs into a drunk Mahiru Seki, an old friend, who exclaims he is in love with a woman with whom he hangs out at night. Yamori runs into Kikyō, who asks how things are going with Nazuna. He asks what falling in love feels like, so she tries to help him. She advises him to go on a date, but Nazuna refuses, finally agreeing after he shuts off her game. However, she realizes later on the date that Kikyō influenced him and leaves, disappointed.
While a depressed Yamori reflects on his room, Nazuna finds his date plan and returns to his house, where she takes him on a flight, drinking his blood mid-air. Later on, Yamori runs into Seki hanging out with his friends. He then hangs out with him and Akira at the park, inadvertently encouraging him after expressing his own friendship with Nazuna. Sometime later, Nazuna holds hands with Yamori so they will not get separated again, just as Seki passes with his new girlfriend.
Ko investigates the presence of a voyeur at a maid cafe by request of Midori. An encounter with a private investigator named Anko leads Ko to discover vampires are not all he thought they were.
Yamori runs into Kikyō, but Nazuna violently stops her. Nazuna then exclaims that Kikyō herself condemned friendships between humans and vampires. Later, Yamori finds Kikyō again, so they go to a karaoke bar, where Kikyō explains how harsh people can be, which Yamori understands. Just then, one of her admirers begins knocking at the door. Yamori opposes her killing him, but she explains that her antics are not wrong if his death does not affect him. She attacks, but Yamori gets in her way and escapes with him.
Yamori deduces Akihito Akiyama likes Kikyō, and he recalls how they met after she found him drunk on the street. Kikyō arrives, and she goes to kill Akiyama and Yamori for interfering, but Nazuna stops her from above. Akiyama reveals they used to be friends, but he accidentally fell in love with her, which collided with her hatred for romance.
Kikyō confirms this and agrees to never see Akiyama again. However, she breaks down crying, exclaiming she had fun being his friend and wants to continue. Akiyama then offers to become her descendants, to which Kikyō agrees, converting him. They all go to the karaoke to celebrate, with Nazuna exclaiming she and Yamori can take their time.
Call of the Night episode 13 kicked off with Nazuna getting bored whilst playing video games and deciding to take a stroll around the city as usual. On the other hand Yamori visited Hatsuka’s apartment where a middle-aged man and two girls rushed towards the door. The three people addressed Hatsuka using the honorific “Sama,” as if they were her offspring disciples.
The three were irritated by Yamori’s relationship with Hatsuka and began disparaging him. However, the latter, with a cheerful expression, threatened the three of them to leave her apartment immediately. Yamori was perplexed by the recent events, and when he discovered Hatsuka was a boy, he was shocked to his core.
Nazuna confronted Nico, Seri, and Midori, telling them that she had abandoned her plan to turn Yamori into a vampire. Nico, who was furious, told Nazuna that she now had no choice but to eliminate Yamori because he posed a threat to the vampires’ existence. Despite Nazuna’s threats, Nico scared her by asking what makes Yamori different from other humans and why she wants to protect him. There Call of the Night season 1 ends.
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