The idol of the entire school, the flawless and perfect student council president, Nadeshiko Oba-onee-sama.

Watching her from afar used to be my, Sumika Tachibana’s, secret source of happiness… or so I thought!

Out of nowhere, our parents remarried, and Nadeshiko-onee-sama actually became my big sister!!

While I’m left totally bewildered, bouncing between pure joy and utter reverence at this unbelievable turn of events, Onee-sama looks straight into my eyes and says…

“I want you to be my Onee-chan.”

…Wait, what?

After caught-off-guard me accidentally nods along to her sudden request, Onee-sama unleashes an onslaught of coddling, spoiled little sister moves!!

It completely goes against my headcanon, but she’s so cute~! What am I supposed to do?!

The sister-role-reversal girls’ love comedy between a model-student stepsister and a self-proclaimed ordinary me begins!!

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