Envy Series

The Envy Series is one of the seven sins and also one of the two sets from the Curse Series obtained by Motoyasu after being abandoned by his companions.

Overview
When Motoyasu was first a hero, he deeply valued and trusted his companions. However, during the Spirit Tortoise catastrophe, he was overwhelmed and all of his companions (Elena, Bitch, and Lesty) abandoned him. After Motoyasu was rescued from the Spirit Tortoise, he became extremely depressed and broken from the betrayal. Filo attempts to cheer him up. However, in this broken state, Motoyasu begins to become obsessed with Filo and starts seeing other women as literal pigs. From here, Motoyasu unlocked the Lust and Envy Series.

Motoyasu goes on a Filolial-obsessed rampage but is eventually stopped by Naofumi and Filo since he obeys anything Filo asks of him. There doesn't seem to be a repercussion for this curse series. Although Motoyasu sees women as pigs and can't understand their words, it was unlikely caused by the curse.

Trivia

 * It's been implied that the transformed tip of the Legendary Spear while in its transformed form greatly resembles some sort of sex toy from the Modern World.