Matsu

Matsu is another member of Moon Tree's seven counsel and the leader of Unit Seven. He is an adept rogue with a hot temper and a history of PKing. Once known as the "Flame Sword Demon", Matsu was defeated by Sakaki in battle and renounced his PK ways. He joined Moon Tree where he is fiercely loyal to both Zelkova and Sakaki.

Matsu sees Sakaki as his redeemer. Because of their battle and Sakaki's total belief in the wrongness of PKing, Matsu changed. He believes Sakaki "saved him" from being a PKer for the rest of his time in "The World". Like many people, Matsu does not see or even suspect that he is just another violin in the orchestra Sakaki plays so well.

That changes when Sakaki's coup of Moon Tree begins. Matsu finds himself at a loss for what to do. His loyalty is torn between Sakaki and Zelkova. The madness created by AIDA's influence in the area clearly does not help his decision-making skills as his only plan of action is to fight Haseo's party in Sakaki's name. It was the only thing he could come up with and he fights until the end for the debt he owes.

The guild is disbanded after the incident and Matsu and Sakaki rarely come in contact after that. Their only shared point of interest is the PK arena battles, which Matsu was invited to take part in.