Overview:

One day, due to the circumstances of the brother and sister-in-law, your niece will come to live with you in this everyday life simulation game.
You can spend a month with your niece, flirting with her and sometimes playing pranks on her, until your brother and sister-in-law return.
She has a serious and somewhat shy personality.
She has no knowledge of anything erotic, and is completely ignorant at the start of the story.
When she was young, she was attached to the protagonist, but as she grew up, they naturally became distant from each other.

By talking to your niece, new options will be unlocked and her favorability will increase or decrease.
Depending on the choice, you may even teach her naughty knowledge.
The purchased items can be used on your niece, or have an effect just by having them.
Living together means you have a chance to peek into her bath…!?
After your niece has gone to sleep, you can sneak in and play pranks on her.
Try various things so that she doesn’t wake up.
If you gently take off her clothes, you will be able to click on her directly.
You can change positions and have sex
In the nighttime prank part, you can change positions and have sex.
There are three positions in total, and some are only possible if you get along well and have consent…