Because of the words Yuuichi spoke at Cannon Mountain, Rika decides to undergo surgery. Although Yuuichi does not remember what he said, he is glad that he is able to become closer to Rika.

It is then that Yuuichi is visited by his classmate Yamanishi, who aims to borrow some of the "Tada Collection", an extensive collection of adult books. Yamanishi begins to rummage underneath Yuuichi's bed, but at that moment, Rika enters the room!