The all-girls Kikyo Private Academy and Chidori Public High School are polar opposites. With its prestigious history, Kikyo is attended by noble young ladies from distinguished families, while Chidori is infamously full of simple-minded delinquents. It is no surprise that their students clash with their differences. Having a tall stature and fierce appearance, Chidori student Rintarou Tsumugi is often avoided by others despite his gentle heart. One day, while helping out at his family's patisserie, he meets a customer who, after a brief moment, runs away from him. The next day, the customer returns to apologize to Rintarou, introducing herself as the cheerful Kaoruko Waguri. After spending time with Kaoruko, Rintarou appreciates that she does not judge him based on his appearance and looks forward to when they will meet again. However, when Rintarou discovers Kaoruko attends Kikyo, their relationship will challenge the social expectations and dynamics around them.

Takuto Ira succumbed to illness at a young age and ended up reincarnating in a world that resembles the fantasy turn-based strategy game Eternal Nations. Not only did he reincarnate into his favorite game, but as the god who commands the evil civilization Mynoghra. With Mynoghra's beautiful hero unit, Sludge Witch Atou by his side, not even legendarily difficult race traits will stand in the way of restarting their civilization!

Ikurou Hoshi and Sara Haizaki are the concierges at Hotel Inhumans, a hotel that specifically caters to assassins. They fulfill all the requests their guests may ask of them, never uttering the word "no." While Ikurou specializes in research into their clients' backgrounds and careers, Sara protects the hotel with skills to match that of the hotel's patrons. However, despite providing every service imaginable for these assassins, Ikurou despises those who kill for money and claims daily that he is going to quit his job. Yet the more requests he and Sara fulfill on behalf of their guests, the more Ikurou learns about the unexpected humanity found within the assassins. With every glimpse into the lives and motivations of those who murder for a living, the more he realizes assassins are not so different from him or Sara.

Far from the city's noise lies Torishirojima—a quaint and peaceful island where time seems to move slowly. Hairi Takahara, a young boy nursing a wounded heart, uses the recent death of his grandmother as a quiet reason to leave the city for a summer retreat to Torishirojima. Upon reaching the island, Hairi finds himself surrounded by a refreshing, laid-back atmosphere, a far cry from the hustle and bustle he is used to. After moving in with his aunt, Kyouko Misaki, he prepares to spend the summer helping her sort through a shed full of artifacts his grandmother collected over the years alongside his cousin, Umi Katou, who is staying with them. While adjusting to the island's slower pace, Hairi decides to spend his free time exploring. He soon meets the cheerful Tsumugi Wenders; the antisocial Shiroha Naruse; the wandering Kamome Kushima; and the sharp-tongued Ao Sorakado. Drawn into their lives and the island's subtle mysteries, Hairi is gradually swept up in a summer filled with fun, nostalgia, and life-changing moments that will stay with him forever.