My childhood friend Hiromu got a cute girlfriend. That's when I realized. I like Hiromu. But I thought I'd keep this feeling locked away in the depths of Kokoro. But that day, I saw it. I saw Hiromu having sex with his girlfriend. When I saw it... I couldn't hold it in anymore. This is the record of me having sex with my childhood friend while my girlfriend was away on a trip with her family for four days.