I have a strange disease called "If I don't have sex once a day, I'll die." I'm still a virgin and I don't have any female friends, let alone a girlfriend, so I'm on the verge of despair... But my childhood friend Akari, who lives next door, comes over out of concern. "I'd be in trouble if you disappeared... You don't have anyone else, do you? It can't be helped, so it's okay," she says, and we have our first sex... Akari had been having sex out of a sense of obligation, but we started to enjoy each other's daily sex. But then Akari's boyfriend comes over...