Dear, Please Forgive Me... Soothing Immorality Minako Komukai

My husband's younger sister and her fiancé Shigeki are to stay at Haruka and her husband's house for a while. Shigeki aggressively pushes his way into the gaps in Haruka's heart, who had been feeling lonely due to her busy husband. Although she knows it's wrong, Haruka begins to feel a forbidden comfort with Shigeki...