Symbiont Zero-Type by Gekka Kobo

Description:
In 2079, Ella Lane, a former Stardust Biotech security operative, returns to Kuroishi City after a failed experiment turns its residents into wild and violent creatures known as Distortions. Her younger sister Ria, a researcher on the project, had gone missing after sending Ella a distress signal.
With the city under quarantine and Stardust Biotech covering up the outbreak, Ella sets out to find her sister and uncover what really happened.​

2D Game, 2DCG, Animated, Bestiality, Censored, Combat, Dystopian setting, Female Protagonist, Graphic violence, Japanese Game, Monster, Multiple Penetration, Oral Sex, Platformer, Point & Click, Rape, Stripping, Tentacles, Vaginal sex

1. Extract and run.

Demo v0.2
Initial release

Story
The year is 2079, in the near future.
As humanity achieves technological breakthroughs that transcend the barriers of biological genetics, Stardust Biotech secretly initiates the "T-7 Symbiote" project under the guise of "treating incurable diseases." The goal: to fuse human cells with the genes of an unknown extraterrestrial lifeform and create "super soldiers."
However, the experiment spirals out of control. The symbiotes begin to infect humans, transforming them into grotesque, feral monsters stripped of reason—creatures known as "Distortions." To cover up the incident, Stardust Biotech quarantines Kuroishi City, the site of the experimental facility, and deploys a mercenary unit to "cleanse" the area of any survivors.
Ella’s younger sister, Ria, was a core researcher at Stardust Biotech and the only person who knew the formula for the antidote. Just before the lockdown, she sent a distress signal to Ella—but has been missing ever since.
The Final Battle Between Humanity and the Zombies
Ella Lane

Age: 24Affiliation: Former special marksman in the Security Division of Stardust Biotech.Background: Once boasted the company's peak combat capabilities in both close-quarters and firearms warfare. She possesses a calm, decisive nature, yet harbors a somewhat melancholic aura.History: Three years ago, she refused to carry out the company's heartless order to "dispose of test subjects." Framed for misconduct as a result, she was expelled from the corporation. Since then, while living a wandering life, she has secretly continued investigating Stardust Biotech's illegal experiments.
Zombies, insects, beasts, tentacles, spiders—a diverse array of monsters appears throughout the game.
Each enemy type features a unique eventtriggered specifically when the protagonist is defeated.