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Based on the manga series "Tonari no Seki kun" by Takuma Morishige (first published November, 2010 in monthy Japanese seinen manga magazine Comic Flapper): Based on the manga series "Rumi chan no Jisho" by Katsunori Hara (first published 2011 in weekly Japanese seinen manga magazine Big Comic Spirits):

A friendship is formed between an ex-gangster, and two groups of hitmen - those who want to protect him and those who were sent to kill him.

Shushan of Ten Thousand Swords Returns (2022)