Six months ago, Sakuta Azusagawa had a chance encounter with a bunny girl in a library. Ever since then, he’s been blissfully happy with his girlfriend: Mai Sakurajima, that same bunny girl. However, the reappearance of his mysterious first crush, the now-adult Shouko Makinohara, adds a new complication to his relationship with Mai. To make matters worse, he then encounters a middle school Shouko in the hospital, suffering from a grave illness. Mysteriously, his old scars begin throbbing whenever he’s near her.

With Shouko’s bizarre situation somehow revolving around him, Sakuta will need to come to terms with his own conflicting feelings, for better or worse. With a girl's life in his hands, just what can he do?

Uro Yamada works as part of the "Hero Retirement and Return to Everyday Life Assistance Agency," which takes heroes from another world back to Earth and helps them reintegrate into everyday life.

Mikami Inaba was fighting a person from another school on her school's rooftop. As they fought, her friend Haru appeared. Seeing Mikami distracted, the man charged at her, causing both of them to break the nearby rabbit cages & fall off the roof. As Mikami fell, she desperately grabbed the rabbit. Suddenly, a flash or pink light appeared. Mikami fused with the rabbit, and gained another personality, called Mimika. Now, Mikami only appears when various people threaten her and her friends. Otherwise, she takes on the form of Mimika.

Set in Kunitachi City, Tokyo. Reiko Houshou, a rookie detective at the Kunitachi Police Department, is also the heiress of the globally renowned "Houshou Group." She tackles challenging cases alongside Inspector Kazamatsuri, heir to the "Kazamatsuri Motors" family business, and Kageyama, her sharp-tongued butler and driver. With biting remarks like, "Are your eyes merely decorative, my lady?" Kageyama not only critiques Reiko's lack of deductive skills but also brilliantly solves the mysteries at hand. A sharp-tongued butler meets classic detective fiction in this unique mystery series.