Manga written by Mangaka Takeshi Tani:
https://twitter.com/tanitakeC
Mahoutsukai Linn no Shiawase na Kekkon
The hero who is now age (16) who defeated the Demon King at the grand age of 11 and brought light and peace to the world breaks into the room of the NEET wizard (32) and presses for marriage!
Chapter 1
5 years ago
Romance
Comedy
Adventure
Fantasy