金剛丸 三蔵

"In any case, now you have to face me, the Iron Wall of Kongoumaru" 

 The head supporter, as well as Gang Leader of Tokyo's Sensouji School. His fighting power is so great he's called "the Iron Wall of Kongoumaru". Except, he is extremely weak when it comes to his sister Aya. His buckle is a mobile phone.
Alice Soft wiki