Hima nanode Hajimete Mimasu.

Amano Rintarou has looked after his childhood friend, Nakatsugawa Maki, for as long as he can remember. Although Maki has never been particularly sharp, Rintarou has always embraced this flaw, quietly assuming that caring for him would simply be a lifelong responsibility. Their familiar dynamic shifts dramatically when both young men enter university together and circumstances force them to become roommates. Living under the same roof quickly reveals an unexpected change in Maki's behavior. The once-harmless, simple-minded friend suddenly develops a decidedly inappropriate streak—but only when it comes to Rintarou. This sudden shift from ordinary foolishness to targeted perversion leaves Rintarou completely bewildered and struggling to navigate their new living arrangement. Now faced with a roommate who behaves entirely differently behind closed doors, Rintarou must figure out how to handle this startling development. As he attempts to maintain some semblance of normalcy, he is forced to question whether he can continue living alongside Maki and uphold his lifelong promise to take care of him, especially now that their relationship has taken such an unpredictable turn.