The Invincible Man

It is often claimed that an "undefeated" player in mahjong does not exist because of the significant role luck plays. Nevertheless, an undefeated player emerges on Japan's top online mahjong platform, Jansen! This player is known as "M," and to uncover whether M is engaging in cheating, Sonokawa Junpei, a struggling part-time worker, approaches him while pretending to befriend him. However, upon learning the truth behind M's impressive skills, he starts to form a deep friendship with him... The story of a mahjong friendship that confronts the barrier of undefeatedness begins!