Yuta's wife left after they had a fight. His sister-in-law, Ruisa, unexpectedly came to visit when she heard the news. Ruisa wanted to help Yuta and his wife reconcile, as well as assist him with housework. While tidying up the house, Ruisa's sensitive areas kept appearing in front of Yuta, igniting his sexual desire. However, being a sister-in-law, Yuta managed to restrain himself. Despite his restraint, Ruisa continued to push forward! Ruisa took the initiative to bathe Yuta, even deliberately washing his private parts. At this point, Yuta couldn't take it anymore. During the time that his wife was away, the sister-in-law replaced the younger sister, helping to satisfy her brother-in-law's sexual desires...