OVA Tsuma ga Kirei ni Natta Wake

OVA Tsuma ga Kirei ni Natta Wake is based on a visual novel by the same name, released in April of 2017. The story follows a married guy who seems to be perfectly happy with his new life. After a while, he begins to notice that his wife started slutting it up for no apparent reason. He hires a PI to look into her possible infidelity.