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That Summer, I NTR'd My Friend's Girlfriend vFinal
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That Summer, I NTR'd My Friend's Girlfriend is a adult sandbox game developed by MarunomiKobo, built with the RPGM engine. The latest update landed in July 2026. The game runs on Windows and is available in English (Fan Translation).
Overview
The story begins near the end of summer vacation during the protagonists' college years.
One day, the protagonist's roommate brings his girlfriend back to their apartment.
He tells the protagonist that the two of them plan to move out in 20 days, right around the start of the new semester.
Until then, she'll be staying at the apartment with them.
The once peaceful shared living arrangement gradually begins to change from that moment on...
One day, the protagonist's roommate brings his girlfriend back to their apartment.
He tells the protagonist that the two of them plan to move out in 20 days, right around the start of the new semester.
Until then, she'll be staying at the apartment with them.
The once peaceful shared living arrangement gradually begins to change from that moment on...
Features
That Summer, I NTR'd My Friend's Girlfriend features themes and elements such as sandbox, sexual harassment, vaginal sex, 2dcg, anal sex, animated, big ass and big tits.
Frequently Asked Questions
Is That Summer, I NTR'd My Friend's Girlfriend free to download?
Yes. That Summer, I NTR'd My Friend's Girlfriend is free to download, with links to the available builds listed on this page.
What engine is That Summer, I NTR'd My Friend's Girlfriend built on?
That Summer, I NTR'd My Friend's Girlfriend is built with the RPGM engine.
What platforms does That Summer, I NTR'd My Friend's Girlfriend support?
That Summer, I NTR'd My Friend's Girlfriend is available for Windows.
What language is That Summer, I NTR'd My Friend's Girlfriend in?
That Summer, I NTR'd My Friend's Girlfriend is available in English (Fan Translation).
Screenshots
Download Links
These links lead to external hosting providers. Use at your own risk.
Developer Notes
Gameplay
The game is played entirely with mouse controls.
Within a limited amount of time, players choose various actions to gradually deepen their relationship with the heroine.
You can interact with her through activities such as:
Playing minigames
Giving her gifts
Spending time with her
These actions increase your intimacy with the heroine. As your relationship grows closer, new events and interactions will gradually become available.
Features
Multi-Stage Relationship Progression
Develop your relationship through a variety of interactions, unlocking new events and activities as your bond deepens.
Diverse Interactions and Evolving Scenes
As the story progresses, additional interactions, scenes, and branching developments become available.
Fully Animated H-Scenes
All adult content in the game is presented with full animation.
More links may be in the source thread (registration required).
Source Thread
