Omoi-san’s Overwhelming Obsession(2018)

“A love story involving a normal guy and his obsessive girlfriend.”

Karuizawa Ryo is a third-year middle schooler who has a crush on a cute, smart, and popular girl named Omoi Miton. After hearing that Omoi is going to an all-girls high school, Karuizawa decides to confess his feelings to her. To his surprise, she agrees to date him! But... now what? Meanwhile, Omoi has everything planned from the get-go, including transferring to his high school, getting married in two years, and setting up insane rules for their relationship. Because of that, Karuizawa realizes what kind of a person Omoi truly is; a girl with an overwhelming obsession with relationships! Despite his concerns, their dating life begins, painting his high school life in a totally different color.

(Source: Comikey)

Notes:
- Serialisation of the original webmanga.
- Includes one bonus chapter.