He accidentally slapped his stepson for 'seducing' him, and his stepmother apologized in the best way possible. Since his father remarried Yu, Ryota gained another stepmother. Ryota is at an age where he is exploring 'sexual' issues, and his stepmother is incredibly beautiful and alluring, her smile seems to draw his soul away. However, Yu is his father's wife, so Ryota gave up, knowing his feelings would not be reciprocated. Unexpectedly, an opportunity arose. His father would be on a business trip for three days, and Ryota was not going to miss this unique chance! He then attacked Yu to take her for himself! But Yu strongly resisted and slapped him. Realizing she had overreacted, that evening Yu came to Ryota's room to make amends with him. Ryota agreed to forgive Yu on one condition: she had to close her eyes. He used this opportunity to take her again! But unlike the last time, Yu's resistance was weaker this time, as if she was allowing Ryota to claim her body. The pleasure that Ryota brought quickly captivated her. Although she knows that this is wrong, Yu can't stop. She wants to be with Ryota even more. The two of them continuously engage with each other while her father is on a business trip, and even when he comes back, they maintain this forbidden relationship...