Adult PC Game: Flamme Soft - Drain Dungeon Ver.1.04 Final (eng) Archive

When you gain levels and grow strong,
your cum and XP will be delightfully drained by a succubus.
That's one way to play this roguelike non-field RPG.

Make your way through dungeons with simple, quick progress.
Discover random events with almost every ecchi scene
resulting in the protagonist's loss of levels.

There's nothing particularly hardcore; recommended for slightly masochistic fans.