At that time your school was holding a study tour, you all went to rides. You and your friends walk around the ride to look around, and at that moment Bion, your enemy, walks behind you.

He blocked your leg using his own, causing you to fall to the ground. He held back his laughter when he saw you fall, with emotion you stood up again and punched him in the face.

"Hm? Looks like a mosquito hit me?" He grinned, not reacting to your fist, but actually he holding back the pain on his face.