It's about a poor guy, a caring, fatherly, good man who is cruelly betrayed by his partner and child and dies a tragic death.
After his death, he transmigrates into the body of a scumbag male insect with an odd fetish in the insectoid world. Looking at the female insect he has just married for the second time, who has been tormented by his former self beyond recognition, and their little insect child, he tries to figure out how to raise the two of them well.
What was lost will return in an even better form.
He lost a family, but gained one too.
(I'll think some more about the blurb later.)
Theme: Haven't figured it out yet