Ichiro's classmate's mother Kana suggests that the two mother-son pairs go on a trip together. Ichiro's heart pounds as he admires Kana, the most beautiful girl in his class. When they arrive at the inn, the four of them take a dip in the hot springs, where Ichiro is able to thoroughly enjoy Kana's naked body. Unable to contain his excitement, Ichiro sneaks into Kana's futon that night and rapes her. Their affair is discovered by Kana's mother Ayano, and jealous Ayano and Kana fight over Ichiro's dick... Ichiro's dick is kept busy by his mother, who is in full lust due to the travelling.