Recently graduated from BK University, Tuấn was invited by his uncle from SEXTOP1 to work there. At this place, Tuấn found himself in a male-only sales department, with only one beautiful female employee, Hikaru Miyanishi. Although Hikaru was a pretty girl and friendly with everyone, she would snap at Tuấn whenever he got close. Thinking he might have done something wrong, Tuấn invited Hikaru out to eat, but unexpectedly that night Liverpool had a match, so Hikaru claimed she was busy. Disappointed, Tuấn went to the restaurant alone and recognized a girl named Akari there. "Why does she look so much like Hikaru?" Tuấn thought to himself and then called the manager to order for her. When the dish was served... Was Tuấn's suspicion correct? Why does Hikari look so sluggish in the mornings sometimes?