She seduced her brother-in-law and committed adultery. She always stayed close during sex, refusing to leave. (Kato Yui, KIRE-083)

Her husband's three-year memorial service has ended, and her sister and her husband are staying at Yui's house for the past few days because they're on holiday. Yui has hidden her past desires from her brother-in-law, Shin, but... "I can't hold back anymore, I want everything about you."