Masaki, raised with ample love from his mother Iroha, is a complete mama's boy and only feels sexual desire for her. The two are already in a sexual relationship and frequently engage in sex secretly. Although her body craves Masaki, Iroha herself recognizes that this is wrong and struggles with the dilemma. This trip also suddenly turned into just the two of them, causing Iroha to feel a hint of unease.
