Forgive me... I was raped by my husband's old friend 4

Mizuki and her husband are asked by Murakami, their childhood friend, to sign the witness section for their divorce. The two slutty couple respond with hesitation, but Murakami, who had a lot of sexual desires from his wife, becomes aroused by his friend's wife, perhaps because he is accused of his friend's wife. Murakami takes advantage of Mizuki's kindness and exclaims the pain of being single. Mizuki is invited to sympathize with her, but soon...