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.
Seventeen-year-old Asamura Yuuta is a talented young boy. He lives alone with his father and often works evenings to save money for his future studies. One day, he learns that he will soon have a stepsister, as his father recently met a woman with whom he feels happy, and they are planning to live together soon. Although Yuuta is understanding, he isn't quite sure how to approach the subject of having a stepsister.
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.
Tomozaki Fumiya is the top player of the online game Attack Families, also known as Tackfam. Although he uncompromisingly maintains his ranking, his lack of social skills makes him struggle with everyday high school life. He rationalizes this by blaming the complex mechanics and unfair rules of the game of life.
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.
From an early age, Aono Hajime admired his world-famous violinist father, who inspired him to take such a career path himself. However, after his parents divorce, he decides that he will never play the violin again and chooses an ordinary high school without an afterthought.