Akane, Kamejiro, and Riku grew up together in neighboring houses. Everyone said Akane and Kamejiro made the perfect couple, so they naturally began dating. Easygoing Riku loved her too, but kept his feelings hidden out of respect for Kamejiro. When Akane and Riku miss the last train after their first drinking party in ages, they can no longer suppress what they feel. An emotional, erotic love triangle begins with a night of repeated cheating sex and creampies.