One day, Murata finds a woman lying on the street, covered in mud, and can't help but take her home. Unable to resist the woman's defenseless appearance, he makes a move on her. Later, he is invited to a drinking party at the home of a senior who helped him out in his school club, but the woman there is the one from that night! It turns out to be his sister, Meguri. He tries to smile and pretend it's the first time they've met, but she suddenly grabs his hand and whispers, "I haven't forgotten you."