Succubus/Lust Friend

Succubus (サキュバス Sakyubasu) is an enemy and potential friend in Lust Friend.

Profile
''A common succubus found throughout this world. She lives freely and is surprisingly gourmet in her tastes. Like all succubi, she can absorb semen and use [sic] it both for food and for reproduction.''

Strategy
Befriending Succubus is extremely easy: simply use the Action skill and then "Approach her" to obtain the Friend Flag.

If you wish to defeat Succubus, she is weak to Mouth attacks, and her most dangerous skills are Pussy element.

The first Succubus encountered in the game is a tutorial battle, so you can simply follow Fess' instructions. One of Succubus' attacks will bring your Vigor to 0 (to show off the revival mechanic), so bear this in mind.

Sidequest
After you've befriended Succubus, you can talk to a succubus NPC sitting on the bench outside Fess Tower, who is looking for a friend. Introduce Succubus to her and the NPC will disappear. Leave the area and return. There will now be a glowing circle where the NPC was sitting. Examine this for a Rainbow Fragment.