Zero Sum

Zero Sum Zero Sum is a choice-driven casual thriller visual novel. Play as a manager promoted to Project Icarus, navigating dilemmas and temptations while the Phoenix algorithm—and the truth—unfold.

Zero Sum

Zero Sum is a casual visual novel where the plot is driven by your decisions. You step into the role of a manager pulled into a secretive project, where every meeting, event, and temptation brings new dilemmas. Your progress depends on how you choose to respond in each scenario.

Along the way, you’ll meet characters with distinct personalities. As the story unfolds and your relationships deepen, you’ll be able to unlock more meaningful interactions—along with a variety of exciting animated moments.

The game is updated regularly, adding new storylines and characters over time. Developers also continue refining animation details and fixing text issues to keep the experience fresh.

Story of Zero Sum

Zero Sum is an adult visual novel with thriller themes. You play an ordinary manager who suddenly receives a promotion to lead a covert operation known as “Icarus.” The goal of your new position is to make people pay more—using data, algorithms, and the weaknesses of others as your tools.

The catch? You don’t fully know who you’re truly targeting. And once the real truth begins to come to light, it may already be too late to step back.

Project Icarus and the Phoenix Algorithm

An unexpected promotion thrusts a testing department manager into the role of leader for Project Icarus. His responsibility is to finalize and launch the Phoenix algorithm—a system that studies user behavior and increases taxi prices when customers are most vulnerable.

As the algorithm learns, the profits grow. But the protagonist soon realizes the promotion isn’t a stroke of fate—it’s a ticket into a world where morality and profit never meet. With every choice, you don’t just reshape the project’s fate—you change your own.

Of course, the truth doesn’t stay buried forever. Someone already knows too much. Someone is observing. Someone is waiting for you to make a mistake. And when it finally happens, there’s no going back.

Features of Zero Sum

A Shocking Ascension

What begins as a routine promotion quickly spirals into a moral trap. You’ll move fast from a typical managerial role into leading a project that raises serious questions about profit, ethics, and customer exploitation. That sudden shift fuels high-pressure decision moments that shape the story.

Understanding the Algorithm

As you work on the Phoenix algorithm, you’ll have to confront what it does. The more it learns about users, the more effectively it exploits their vulnerabilities—leading to higher earnings. This mechanic-driven tension highlights the conflict between technological progress and ethical responsibility, forcing you to weigh the cost of success.

Consequences of Choices

Every decision affects more than just the project—it also influences your career path. You’ll constantly balance short-term wins against long-term fallout, creating a sense of urgency and moral complexity. The stakes are high, and the outcome isn’t guaranteed.

Ethics vs. Profit

You’ll face many situations where ethics directly clash with financial incentives. The game presents moral dilemmas that challenge you to decide whether to prioritize profit or customer welfare. These choices are meant to make you think about business behavior in a competitive world.

Character Interactions

Meet a range of characters, each bringing a different perspective on the project’s ethics. Whether it’s ambitious coworkers or concerned stakeholders, they all affect how the story unfolds and what alliances—or rivalries—form over time. Your interactions play a major role in shaping the narrative direction.

Player Comments

• A realistic, very cynical story with no fairytale vibes. That’s what hooked me. Ethical controversy, models that look like real people (not cartoon characters), and some really intense scenes. Overall a solid start—about a 4/5. I hope the story keeps its momentum.
• Futa is avoidable. There isn’t a huge amount of content yet, but since it’s the first release, the amount feels fair. Animations are excellent (and even if they’re AI, they’re hard to tell). The models look great, and the sex scenes are hot and fairly realistic—especially the first office scene. Rating: 4/5 for a first release. Overall, promising and worth trying.
• So far, I’m enjoying it a lot. The story’s kinks and the choice system are great. I only wish choices available in one scene were also possible in another similar situation, but I understand why they aren’t. I read most of the dialogue and it feels fine. Characters don’t ramble too much—each person has a distinct, often extreme personality. That’s a positive thing early on. The characters are interesting, and the story has strong potential since we can shape what happens.