Kumi Kouji

Kumi is the deliquent that used a love letter to lure Aren (Kumi used a pen name Kumiko) to meet with him and his gang to beat him up not knowing that Aren is stronger than them, they met their demise after being overpowered by Aren who beat them up easily.

Trivia

 * His real name and character profile was found in the character guidebook.