
The daring explorer Serena and the kindhearted succubus Nerisha meet by chance in the depths of the Underground. Succubus Research Diary is an adult visual novel about the unusual and very intimate relationship between the two women.

There are many things one can do for the first time.

Not quite yet halfway there.

The nth day

Reached one of the endings.

Seen all endings.

Maxed out certain two bedroom activities.

Maxed out certain three bedroom activities.

Only true cowgirls can achieve this.