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I have a strange disease, ``If you don't have sex once a day, you'll get sick''. He's a virgin and doesn't have a girlfriend or even a female friend, so he's at the brink of despair. However, Akari, a childhood friend who lives next door, is worried and comes over. "I'm in trouble even if I'm gone... I don't have another partner. It can't be helped, so it's okay." Akari, who had a sense of duty, began to enjoy playing with each other in daily SEX. However, Akari's boyfriend comes...