Is Yaga a special grade?

Yaga was later classified as a special-grade jujutsu sorcerer for the potential strength of his technique, with which he could potentially create an army of cursed corpses.

How did Masamichi died?

He was likely a capable close range combatant, as he was the one who taught Panda to fight and was willing to fight a fellow sorcerer without the use of his cursed corpses. While he was defeated, Masamichi was able to injure Gakuganji and break his guitar before succumbing to his wounds.

What did Masamichi do?

Toshihiko Hasegawa (1950 – December 27, 2001) and Masamichi Ida (1942 – November 19, 1998) were a pair of Japanese serial killers who conspired to kill three men to obtain life insurance money between November 1979 and December 1983 in Aichi Prefecture and Kyoto Prefecture.