I read this because I thought people were overreacting about how poorly MC is treated, and that it is actually very wholesome.
I mean, it IS wholesome but man the husband is such a masochist and a pushover, and the wife is so distant when it comes to intimacy.
Headcanon: Husband thinks kids are conceived through kissing, none of the kids are his (even the one currently in the womb) because wife has a lover (unbeknownst to husband who spends 99% of his time at work; also explains why she doesn't get intimate with him) and she is only using MC as a babysitter and money maker.
Shingo: "Throughout matrimony and parenthood, I alone am the cucked one".