The Girl I wanted So Badly Wasn’t Mine… So I Fucked and Impregnated Her Behind My Wife’s Back! Now We Are A True Family! Yumeru Kotoishi (2021)

Sinopsis

The "love" I had for Yumeru wasn't family love, but love... The daughter I've raised with care doesn't look like me at all. "If you walk with me, you'll be mistaken for being a daddy!" I wanted to dispel her colleague's words, so when I did a DNA test... she wasn't my child. It doesn't matter who's child, if you're not related by blood, it's a free man and woman. It means that you can love a lot, have sex, have children, and become a real family, right? You said when you were a kid that you wanted to marry your father. I'll love you more than ever, Yumeru.