Kentarou's former shogi teacher taught him to (metaphorically) dive into the 81 squares of the shogi board. Thus, his nickname is "81 Diver". He has failed to enter the professional league of shogi competiti...

Shinichirou would rather spend his life playing games on the internet, but sadly he's a heir to a company. His grandfather deems his current life-style unfit for a heir, so he throws him into a house with ei...