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Nanami Takahashi is a high school student entering her first year. Immediately on her first day however, she becomes the victim of a practical joke by the school's most popular guy, Motoharu Yano, who coincidentally also ends up in her class.

Koyuki Tanaka's boring life is changed after meeting Ryusuke Minami, a local musician with a bad attitude, who introduces him to foreign music.

Two different students - a successful but aloof academic and a rebellious but kindhearted delinquent - form a friendship through their love for music.

Banri Tada is a freshman at a Tokyo law school. After an accident, he suffers severe memory loss. Despite the incident, he befriends fellow freshman, Mitsuo Yanagisawa, which leads him to the beautiful, yet obsessive, Kouko Kaga.

Shinichiro is a student living in what would be a dream come true for most high school boys, but for him is mostly a frustration. A well liked girl in school named Hiromi has lived in his house for a year along with his family. Her father was a close friend of the family, and when he died they immediately took her in. She is popular and well liked, always smiles, is talented in sports- but Shinichiro knows there must be tears inside her. Having an artistic tendency, he makes watercolours of her and thinks about wishing to ease her tears. Yet he cannot bring up the nerve to talk to her even in his own home. She, too, is quiet and withdrawn in their house, quite unlike at school. Shinichiro is also distracted by teasing from his friend Nobuse for watching Hiromi from afar, a curse of bad luck from a strange girl named Noe, and being forced to perform Muhiga dancing. By helping Noe he hopes to ease his own problems, yet he seems to have difficulty helping himself.

Hairi Takahara never expected summer to feel like a dream. Sent to Torishirojima to sort through his late grandmother's belongings, he's met with endless sea, quiet nostalgia, and mysterious girls, each chasing something just out of reach. As he settles into island life, lost memories begin to surface and he finds what he never knew he'd lost.

Rishe, the duke’s daughter, is no stranger to reincarnation—it’s her seventh life, after all. Each life restarts at her broken engagement. Having been a merchant, a maid, and a knight, she now desires leisure. But her world changes when a prince, who killed her in a past life, proposes! To prevent war and live to a ripe old age, she begins her seventh life as the bride of an enemy nation’s prince.

At the end of the second semester of third year of high school, four students are prepared for graduation and feel the ending to their high school life. But that changes a little with the arrival of a transfer student.

In a futuristic society, Japan has implemented a complex system referred to as "The Red Threads of Science" to encourage successful marriages and combat increasingly low birthrates. Based on a compatibility calculation, young people at the age of 16 are assigned marriage partners by the government, with severe repercussions awaiting those who disobey the arrangement. For Yukari Nejima, a teen that considers himself average in every way, this system might be his best shot at living a fulfilling life. However, spurred by his infatuation for his classmate and long-time crush, Misaki Takasaki, Yukari defies the system and confesses his love. After some initial reluctance, Misaki reciprocates his feelings in a moment of passion. Unfortunately, before the two can further their relationship, Yukari receives his marriage notice. He is then thrown into a confusing web of love and lies when his less-than-thrilled assigned partner, Ririna Sanada, becomes fascinated with his illicit romance.

Shuichi Nitori transfers to a new elementary school, and there, meets Yoshino Takatsuki. The two children discover they share a similar secret.