World-Class Investigation: Zer0-Sum

World-Class Investigation: Zer0-Sum (previously World-Class Investigation: Poison Ivy), also referred to as just Zer0-Sum, is a murder mystery story, planned to serve as the opener to the fourth generation of Gaboza stories.

On June 1st, 2025, it was announced by Gaboza that "World-Class Investigation: Poison Ivy, as [we] know it, is cancelled," implying the story will still exist in some capacity, though it's likely to undergo extreme changes. This news came shortly following the reveal of Gaboza's Killing Game: Ivy League's return on May 29, 2025.

On June 4th, 2025, an image of a new character was revealed, as well as the new title: World-Class Investigation: Zer0-Sum.