183cm 74kg September 15th B Reading, ink and wash paintings Company, hot springs, watching baseball games Fiendish deeds, being called Dotachin Sushi, soba with tempura, green tea Nothing in particular, but he's not very skilled with forks and knives. "When you are standing at the batter's box of life, don't get struck out!" - Kobayashi Shigeru (professional baseball player)

Originally part of his own gang, Kyohei is now member of the gang Dollars. He has a nickname "Dotachin" which is used by several characters in the series (mostly Izaya and Erika).

One day he got a message to join the gang Dollars. He first thought is was a joke but on the next day he saw his login name (MONTA) on the list of the members of Dollars.

Monta originated from his last name (門田), because 門 is also read as Mon and 田 (Ta) stays the same.

Him and other members never saw the leader of Dollars, but he has a suggestion who the leader is because there is only one person who could organize such a strange organization. His suspicion is on Izaya Orihara. Izaya was also the person who gave him the nickname "Dotachin".