By the Grace of the Gods: Temporada 2, Episodio 10

Following a request from Worgan, Ryoma and some of his fellow adventurer friends take on a quest in a nearby forest to harvest Treant materials. They get more than what they bargained for when they have to face off against an evolved version of the Treant monster, an Elder Treant..

Kami-tachi ni Hirowareta Otoko