Not all of Kouji's work are sad and despair this one has more light and hope it in with Suzume no Uta!

A gambling mahjong yakuza reincarnates as a elementary school kid (Yep that's the plot and yeah this is a weird one alright but it made by the guy who made touhai so what can you expect form him xD)

Its the 3rd part to the tohai series if you don't know what this series is about well its about Kei who you may think is just an average high school boy but in the mahjong underworld he is know as "Ice Cold K", a prodigy who wreaks havoc at high stakes parlors with his ruthless and calculating play style he one day met a man named Dojima, who teache him the true meaning of gambling and more of less kei's life got really crazy and that ant even the half of it

Did you think tohai and Mahjong Club where the only two Mahjong manga's he did? NO he has more and here one form the world of Young King the magazine who brought us the crazy world of Excel Saga to the world of no typical highschool-slice-of-life story with Gang King

This revolves around Baku Ōmura, a hot-blooded young man who attends the private Yagisawa High School. He hates people who break the rules, and as he takes on many of his schoolmates and adults in various games of gambling, he sees through cheating with his wit and skill.