Yokoya Hitoyoshi is a young high school student living alone, as his family is away from home almost constantly. The boy lacks the motivation to keep his place clean and often suffers from loneliness. One day, a beautiful maid appears at his gate and asks to be hired. As they talk, she eventually reveals that she has worked as a professional assassin since she was a child. However, her employer has retired and recommended she go to the Yokoya estate, which supposedly belonged to his distant relatives.
Amakusa Kanade's life isn't easy. He's afflicted by a curse that prevents him from functioning normally in society. From time to time, he hears a voice in his head forcing him to make difficult and often absurd decisions. Each scenario offers him two options: the first, at best, embarrasses him in public, while the second is even worse. He cannot refuse, as the penalty is an unbearable headache. To make matters worse, these situations almost always occur in public places.
Okumura Masamune becomes the sole member of his high school’s manga club after his senior peers graduate. The boy proclaims his 100% devotion to 2D girls and expresses a complete lack of interest in their 3D (real-world) counterparts. He soon starts to miss the time spent with people who understood his hobby and passion. These reminiscences are interrupted by a knock at the door. When he opens it, he sees an attractive girl who introduces herself as Amano Ririsa and says she wants to join the club.
Kasukabe Hayato returns from Tokyo to his hometown following the death of his grandmother, Sachiko, who raised him. He has inherited the Familia Café Terrace, the café she ran, but has no intention of continuing the family business. Instead, he plans to demolish the building and construct a parking lot.
In the near future, rising sea levels have submerged most of the land and human habitats. Ikaruga Natsuki lost his family and his leg a few years ago. He decides to find his old home in a small seaside town, which is now mostly underwater. All he has left is a small ship and a submarine inherited from his grandmother, a renowned oceanologist. His hope for a normal life is spurred by a somewhat suspicious debt collector, Catherine. Natsuki’s task is to repair the submarine and prepare it for a journey to the ocean floor to retrieve valuable items left behind by his recently deceased grandmother.
Nakamura Rin has just started at a new school and wants to join the drama club. While looking for the room where the club members meet, she encounters a boy named Kitahama Eiji, who is a member of the club. He leads her to the meeting place and introduces her to the other members. It turns out that Rin has incredible acting skills, and just a few lines from Romeo and Juliet were enough for the club president to welcome her with open arms.
Nukumizu Kazuhiko is an observer type. He describes himself as a supporting character. He often watches situations people find themselves in and wonders what he would do if he were in a similar scenario. One day, while eating at a restaurant, he notices his classmate, Yanami Anna, with her childhood friend. He realizes he is witnessing her confession of love being rejected in favor of another girl.
Towa gets an assignment from God to descend as an angel from Heaven to Earth and learn how to live among humans. The purpose is to help her better understand the motivations and behavior of individuals so that in the future she can better help troubled souls and guide them to the right path.
Ichikawa Kyoutarou may seem like an average guy his age. However, deep down, he harbors a secret desire to commit murder. His first target? The class idol, Yamada Anna. However, everything changes one afternoon when he strikes up a conversation with her in the school library, where she’s quietly enjoying some snacks.
Shiratori Ryuushi is a young artist who dreams of writing and illustrating children's books. To achieve his goals, he decides to move to Tokyo for training in this field at one of the local schools. He is to live in the Narutakisou estate with his distant cousin, Aoba Kozue. Upon his arrival, he is welcomed by her, the owner, and the other residents, who live together like one big family, helping each other out.
Aono Tsukune isn't doing well in school. His terrible grades have made it impossible for him to find any high school that would accept him. At the last moment, his father arranges for him to attend Youkai Academy, unaware of the fate that awaits his son.
Mukai Naoya and Saki Saki have been close since their childhood. For a long time, Naoya has secretly harbored feelings for his childhood friend and eventually decides to confess to her. Saki reciprocates his feelings. Shortly thereafter, Naoya finds himself in a similar situation as Saki. Atop the school rooftop, Minase Nagisa confesses her love for him.