Two twins – Haruka and Sora, his younger sister, are going back to grandfather’s house.

They visited this house many times when they were kids and they still remember it. A while ago, they lost their parents in a car accident and they decided to move and live at their grandfather’s house…. Nao, their old friend, Ryouhei, his classmate, Akira, a miko at a neighboring shrine, and Kazuha, Akira’s close friend, welcome them.

Nothing is changed. His good old memories and silent atmosphere heal his sadness. However, his peaceful life gradually changes when a secret promise made long time ago. A lost treasure. A real reason for moving to the town. Real feelings. The story now starts under the summer sun.​

• Setting your PC locale to Japanese
• Installation for the game requires the PC locale to be in Japanese, to change it:
• Control Panel >Clock and Region >Region >Administrative >Change system locale.
• Getting a CD mounting program (see the edit below)
• The version of the game you downloaded is technically the "physical" version of the game, so you require a CD drive to run the installation. We will use a program that acts as a CD drive in order to mount the game file. I used Daemon Tools, its small in size, has a nice UI and is really easy to use. Download here. The free lite version will suffice.
• Install and run Daemon Tools.
• Click 'Quick Mount' at the bottom left corner and select your .mdf file.
• From File Explorer go to the disk drive that appears and click the game disk.
• Run 'setup.exe' and install the game (as I already have the game installed running the process again would wipe my game data so basically just click yes or "はい" and select where you want the game to install).
• Congrats the game is now installed, you can unmount the disk from Daemon Tools and uninstall the program if you wish.
• English Translation Patch
• As of May 2020, translation is complete but editing and proofreading remains an issue. The game is completely playable in English though.
• Open the folder where the game was installed.
• Open the 'system' folder
• Replace the 'yosuga.csx' file in the folder with the one downloaded from the discord. You may make a backup of the original if you want just in case.

• Dual Core Pentium or equivalent Processor.
• Intel HD 2000 or equivalent Graphics.
• 1.39 GB of free disk space (Recommended to have twice as much free disk space than this).