Secret Cohabitation with Big Sister — A Milk Tea Bond Thicker Than Blood [v1.0] [kosya]

Info

Title: Secret Cohabitation with Big Sister — A Milk Tea Bond Thicker Than Blood
Original Title: お姉ちゃんにはナイショの同居生活——血より濃いミルクティー関係
Genre: Casual
Developer: kosya
Publisher: kosya
Release Date: 2 Mar, 2026
18+

Secret Cohabitation with Big Sister — A Milk Tea Bond Thicker Than Blood Overview

Download Secret Cohabitation with Big Sister — A Milk Tea Bond Thicker Than Blood (Windows) – free full game, That day, after that stream ended── The sister, freed from the family’s financial struggles thanks to a mysterious sponsor’s support, and her younger brother, now a college student. The two had finally regained a “normal life.” However, one day, an “Intimacy Gauge” suddenly appeared above their heads. It clearly showed that their relationship was no longer “normal.” In the mornings, they prepare meals together. At night, they snuggle on the sofa watching movies. Their fingertips touch in casual gestures. Before they know it, their alone time grows longer and longer. The “fictional love” they performed in front of the streaming camera, gradually, within their daily lives without cameras, quietly but surely transformed into “true feelings”── Until the day they cross the forbidden line. The “romance simulation” life of this sibling pair, growing tender, gradually more intense and passionate, begins now.

Changelog:

February 5 2026

The following bugs have been fixed: event progress stopped, effect reversal, favorability not reflected, translation omitted, etc. Minor issues have also been improved.

Developer Notes:

H Scenes: 16 scenes total (Unlocked progressively as the story advances)

Dynamic animations with 3+ intensity levels in all H scenes
Cross-section view toggle ON/OFF available
In some scenes: real-time clothing change available
In some scenes: insertion position change supported

System Requirements

OS: Windows 7
Processor: 2.0Ghz
Memory: 1 GB RAM
Graphics: 128Mb
Storage: 30 MB available space

How to Download

Click the Download button below and you should be redirected to Link.
Download The Game from the given link.
When the game is downloaded Double click the game folder and run the Pre-Installed (Already installed) Game and play it.
Have fun and play! Make sure to run the game as administrator and if you get any missing dll errors, look for a Redist or _CommonRedist folder and install all the programs in the folder.

DOWNLOAD HERE:

Win: DataVaults

Support the Developers: kosya