Tensei Oji-san, Heroine ni Naru.

He is an honest, loving, family man.
Ittetsu Wakigata, 45 years old.
He has been a salaryman for 23 years and has risen to become a general manager. He likes to read shoujo manga.
He lives an ordinary but happy life.
A salaryman transmigrated into the world of shoujo manga...?
"How did I end up as a high school girl in a place like this? I have to get home, where my beloved family is waiting for me!"
This is the story that makes you want to cheer for the protagonist.
A comedy of love and laughter about a reincarnated ojisan!

(Source: Comic Polaris, translated)