Miran Katsuki, a positive gal who reigns in the upper class of the school caste, often asks Shuji Nagasawa, an otaku. I was confused by her suggestive behavior, but she unexpectedly announced that she was his fiancée!?
One Day, I Suddenly Got Myself a Gal Fiancée is a completed manga by Kazuki Izumiya, first published in 2024. It blends romance and comedy. You can read all 21 available chapters of One Day, I Suddenly Got Myself a Gal Fiancée online for free on MangaPulse; the newest is Chapter 21, added 2026-09-23. The series is finished, so you can read it from start to end in one go.