after losing her husband, a mother and son live together. the son, who loved akane more than a mother, goes on a hot spring trip for their last memory before his job transfer. the son steals a kiss from his mother, whom he loved as a woman. despite knowing it's wrong, the mother struggles between familial bond and sexual pleasure. gently caressed, her secret parts overflow with juices. the mother takes in her son's cock, inviting him into her ripe womb. they make love repeatedly, embarking on a forbidden journey of incest.