ROYD-118 If I don't have sex once a day, I'll catch a disease that lasts a lifetime. I had sex with my overbearing childhood friend countless times. Akari Minase

I've contracted the strange illness "A disease where you die if you don't have sex once a day." I'm a virgin with no girlfriend, let alone female friends, and I'm at my wits' end... However, my childhood friend Akari, who lives next door, came to check on me. "I'd be in trouble if you disappeared... And there's no one else for you to be with, right? I guess I'll have to do it." So we had sex for the first time. Even though Akari did it out of a sense of duty, we started to enjoy playing together every day. But then, Akari's boyfriend showed up...