Madoka and Tatsuya are childhood friends who are secretly dating each other's parents.Their relationship, which they hoped would last forever, crumbled when their parents remarried. The position of brother and sister tore the relationship between the two.Under the same roof, each other's presence felt far away.Tatsuya's classmate girl who sews the gap and approaches Tatsuya.She becomes jealous and Madoka presses Tatsuya for a physical relationship again. The two secretly returned to their lovers.However, their happy time is short-lived, when their parents find out about their relationship and force them to break up.Tatsuya chases after Madoka, who ran away from home.At the beach they arrive at, they pledge eternal love to each other.Two childhood friends kept secretly having vaginal cum shot SEX in their daily lives.