He then have a talk with the boss. When he return, wife and boss was waiting for him and wife decide to tell him that she's fallen in love with the boss and blame herself since she didn't know there could be different forms of love, a gentle love (husband) and a passionate love (boss) so she choose to be with the boss and ask for a divorce her.
Husband say he'll love her despite of it and pisses the boss, wife however was torn but decides to go live with the boss.
Wife side - she act like a married couple and is now living together with the boss. She would go in to husband apartment to clean and cook for him. Because she know that her husband cannot let her go, she cries because she will just make him suffer with the way she lives now and decide to leave a recording of her having lovey-dovey sex with the boss to her husband so he could let her go...
So there is an interesting point to be made about the "passionate love" that the wife claims she has for the boss in NTR (in general) that I feel like the ending messed up and why the ending doesn't work. For starters passionate love is basically built on sex and really good sex, this is kind of the linchpin to MOST NTR stories where the wife/gf has sex with somebody else who makes her feel sex like she has never experienced. In real world terms this very much exists, where basically you meet somebody and have amazing sex, but the relationship fizzles because a relationship cannot survive on sex alone usually leads to huge differences between the couple with one of the partners cheating or them blowing up into a big fight ending is either domestic violence or more likely breakup. These types of relationships are pretty common, especially now with a lot people unable to form relationships and just tinder fuck.
From an NTR point of view/story teller I don't think this ending worked (although I did enjoy the overall game until this point) because the NTR stopped. Its not longer NTR when you've split up, yes its an end result but it feels less like NTR and more like a breakdown of the relationship especially for a marriage. This has always been one of my major issues with NTR and one reason why I've always advocated that an ending for Marina where she could leave Kenji needs to be based on a breakdown of their relationship most likely because of Kenji's insistence for her to do something she's not enjoying which would damage any relationship. Otherwise simple breaking up a marriage, leading to divorce and a broken home for their child is a LOT more complicated - its also the reason why most affairs are started by the person who was betrayed not the person who betrayed unless their relationship no longer exists beyond the platonic.
So to me for a NTR story/game to end like this feels a little unrealistic and foolish on the wives part, because it does sometimes happen in real but it always ends with the wife alone in the end because sex cannot sustain a relationship and more often then not the man usually cheats on her anyway because he grows bored of her, usually because she was meant to be just another conquest for him. Thats basically what NTR is built on, the netori guy going out for conquests - not stealing away wives or girlfriends to claim for their own.
Although come to think of it, unless the betrayed husband has an NTR fetish I'm surprised more do not end violently ESPECIALLY for Japanese stories, in a sense NTR has the trappings of so many horror movies ready to happen. After all how many wives and their lovers have met an end to betrayed husbands...come to think of it I don't think I can recall a SINGLE NTR story or manga, doujinshi ect that ends with the husband violently killing the netori guy or partner. Which makes me think then that most of them have an NTR fetish and wanted this to happen, as anger is a natural emotion for them to feel after having their heart broken.
Anyway I'm not advocating for that type of ending, rather I think the perfect NTR ending to games/stories like this is where the wife keeps cheating on her husband despite re-assurances its over because she wants both lives, the passionate sex of her lover and the loving husband.
I think more then anything with such an ending - well I don't see too many people getting a hard on for divorce and NTR is about arousal after all.