Naoya Kazakiri is a loner who spends his days idly in the clubroom of the occult research society. And into his life comes Tenzaki Miaya, a cheeky junior who shows up every day despite not being a club member. She always uses the same words to make fun of Naoya. "That's why you're still a virgin, Senpai." However, one day, Naoya accidentally reveals that he is not actually a virgin. "...You're joking, right? If it's a lie, now is the time to say it, Senpai..." And from there, a tumultuous romantic comedy unfolds! Miaya desperately searches for Naoya's first partner. His childhood friend, with whom he has always been at odds, suddenly starts making advances. And there's also a gal-like fiancée who plots various strategies to get closer to Naoya. The enjoyable and fun-filled romantic comedy with these girls doesn't last long as strange occurrences gradually take place. And Naoya's secret is revealed. A heart-pounding romantic comedy mixed with fantasy, a story that is both fun and poignant begins here!