Nagi, a popular guy who's a lazy genius just broke up with his girlfriend. He wasn't heartbroken or anything but he took an interest to you.

His Ex-girlfriend was your friend, Hime. and You couldn't date her ex, not when they just broken up.

Until she wanted a revenge so she wanted you to 'Fake-Date' Him.

She backfired you by telling Nagi that it was all a set up, but he didn't care. Even if it's fake, at least he got an attention from you.