A childhood friend who has a bad relationship with other people

What Happens Next

A Trivial Girlfriend

A Boyfriend's Image

A Suitable Pair

A Makeover Mission Full of Hurdles

The Next Step

Beyond Expectations

A Trump Card Spell

Even Now, At This Moment

The Night Before The Big Event

Time for the Real Thing

My Childhood Friend

From Here On Out

Omake & Extras

A Fake Couple's Natural Enemy: Fabulous-sama

A Secret Item

A Room For Two

An Innocent Couple’s Normal Reactions

An Inexperienced Couple's Normal Response

Masaichi Mazono, an otaku boy, and Toiro Kurumi, the most beautiful girl in school, are childhood friends with a relaxed relationship. Toiro, tired of receiving unwanted romantic attention at school, asked Masaichi to pretend to be her boyfriend. Since they've been together all their lives, they thought it would be easy to be a fake couple, but there is no way that these childhood friends, who have such great chemistry with each other, can end up being just fake lovers... 
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(Source: Tonari no Young Jump, translated)