Nagi Umino was mistakenly switched at birth, and now attends a prestigious private high school. One day, he has a chance meeting with Erika Amano, an incredibly high society high school girl who claims she's on the way to meet her fiancé, and who asks/forces him to be her fake boyfriend. Neither of them, at the time, understood the significance of their meeting for Erika was the girl Nagi was switched at birth with, and Nagi was Erika's soon-to-be fiancé. The curtain raises on a romantic comedy of intertwined fates that begins with being switched at birth.

High schooler Hayase Nagatoro loves to spend her free time doing one thing, and that is to bully her Senpai. After Nagatoro and her friends stumble upon the aspiring artist's drawings, they find enjoyment in mercilessly bullying the timid Senpai.

"If you blush, you lose". Living by this principle, middle schooler Nishikata gets constantly made fun of by his seat neighbor Takagi-san. With his pride shattered to pieces, he vows to turn the tables and get back at her some day. And so, he attempts to tease her day after day, only to find himself victim to Takagi-san's ridicule again sooner than later. Will he be able to make Takagi-san blush from embarrassment even once in the end?

Igarashi Futuba's new job would be great if her senpai, Takeda Harumi, wasn't so incredibly annoying. Futuba hates his laugh, she hates how big he is, and she really hates that he treats her like a little kid. Just because Futuba is short and looks young doesn't make her a kid, and just because she spends so much time with Takeda doesn't mean she sees him as anything but an annoying senpai - or does she?

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