Incubus Quest

Yuu Aoba has a problem. He is in love with his mother, Mieko. And he has trouble keeping her eyes open when she wears light clothing in the summer.

Then, she starts playing with his friend, Taiki Shimosaka, in her room. However, his mother, who welcomes him, is not comfortable with her thin clothes.

Eventually, he starts playing with a girl who knows Taiki, Izawa Hinano.

One day, two of his friends discover a pornographic video of his mother that he had been hiding. Yuu is pointed out as a motherfucker, and is tormented by shame and guilt.

The three of them continue their relationship, but the day comes when he is alone with Hinano. Yuu is teased for being a mother con, and is told that she will correct him...

Your parents leave overseas for work, and you're home alone with your stepsister, Kurumi.
Kurumi is a bright and energetic girl who loves to tease you.
She knows exactly how to flirt and be naughty around her virgin older brother.
Even if it's just by marriage, you know you shouldn't get involved like that with your sister, but...
You might just give in to the cute Kurumi and cross a line that's forbidden to an older brother...

A remake of Tsui no Sora included in the 10th anniversary Subarashiki Hibi package, including a fully rewritten script that is 1.5 times the size of the original and a "whole new work of its own".

The protagonist, “Leon,” spent his childhood in an orphanage in a rural village with other orphans, the girl “Sara” and the boy “Jake.”
However, they eventually part ways. Years later, as an adult, Leon coincidentally reunites with Sara, who has grown into a beautiful and voluptuous woman.
Conflicted by the changes but comforted by their childhood bond, Leon decides to live with Sara.
Initially reserved, Leon gradually accepts living with Sara, whose essence remains unchanged from their past.
Little did he know, there was another side of her hidden from him.

Over the course of her illustrious VTubing career, her cheeky attitude has made her more than a few enemies.
One day, she wakes up in an unfamiliar room with a rope around her neck, balanced on a single leg atop a stool.
And that's where the game begins.