Depends what you mean by NTR. If it's about a male being cheated on, then there are just a few events that may be classified as NTR by some. If you look at it from perspective of NPC female characters then Mike is a major league womanizer, somehow able to build a harem at home, a harem at work, a harem in the girl-band he joins, a threesome between two best friends, a threesome between his gym trainer and the girl that stalks him... With enough charm, gifts, dates, compliments and buttslaps he can fuck whomever he wants, have 6 slave girls and 5 girlfriends, some of which know about one another, some don't.