** The Story

He woke up to find his body has shrunken.

Places where he does not remember and his vague memory...

He attempts to find out the reason why his body has shrunken
by regaining his memories while reading old diary and meeting his friends.

While he continues his investigation, Suddenly Succubus appears and she collects his
semen repeatedly.
His semen may dry up unless he solves the mysteries quickly...

** Characters

* Leading character: Yuuki
Since long time ago, it was his customs that he sleeps naked.
He does not know why his body size has shrunken.
He cannot recall anything, and his memories are vague.

* Succubus: She looks she is used to sexual activities. But she is not as well trained as she should have been.
She still is a new comer as Succubus.
She is friendly towards the leading character.
Whenever she shows up in front of the leading character, she forcibly collects his semen.

** Multi-ending

There are three different endings.

** ADV and RPG

As you proceed, you will be solving the mysteries, and at the same time, you will be tossed around by Succubus.
The shrunken Shota gets seduced by Succubus sometimes forcibly and sometimes gently, and gets his semen squeezed out.
The story is full of situations suitable for masochistic men.