「—Hey, Sho. Will you be my boyfriend?」

Called to the rooftop by Arisugawa Mirei, the school's idol, Sho suddenly finds himself asked to become her boyfriend.

Naturally, Sho is bewildered.

However, Mirei's true desire was for Sho to be her fake boyfriend, a ploy to keep other boys away.

She explains that the only one she can trust is Sho, her cousin and childhood friend.

Despite his misgivings, Sho can't ignore his cousin's predicament and agrees to the fake relationship.

—But Sho never imagined.

...that this relationship would make them more than just cousins.

※Currently serialized in advance on Kakuyomu.

(Please note there are some slight differences from this version.)