Envy.
One of the seven deadly sins.
It's the twisted mix of resentment and longing, that gnawing ache when someone else has what you want—whether it's good fortune, talent, or just plain excellence. It drives the desire to take it for yourself. Envy can fester, material or spiritual, corrupting everything it touches. It's not just a sin. It's a gateway to all sorts of other fucked-up behavior. It can make people feel entitled, pissed off, or downright jealous.
It's a dark, primal emotion, buried deep in human nature. Mortals are cursed with it, and no one escapes its pull. Everyone has felt the sting of envy at some point.
Takahashi Riku was no exception. That bitter emotion churned inside him, pent-up and raw, as he crossed paths with someone unexpected.