いろはにほエロ! (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: Onimu Daioh, a strong-faced but gentle high school student, has a problem: for some reason, he becomes bitter when he comes into contact with the opposite sex. One day, a junior who calls himself "Momiji Minase" appears in front of Onitake and unexpectedly confesses to him, "Please be my pet.

(Translator: DeepL)