Hentai Manga like Shokushu no Kenkyuu

Fukuro no Nakami

Status: Finished
Genres: Hentai

This manga is a collection of short stories:

Ch 1: Cat-Neesan's Counterattack
Ch 2: Gentle Bespectacled Devil
Ch 3: Immorality's not Scary at All
Ch 4: Love, Love, Really Love
Ch 5: Endearing Body
Ch 6: Sympathy for the Devil
Ch 7: Sweet Kiss
Ch 8: Lapis Lazuli
Ch.9: The Bag's Contents

Inbi na Doukutsu no Sono Oku de

Also known as Inside the Tentacle Cave.

Status: Releasing
Genres: Adventure , Ecchi , Fantasy , Supernatural

Deep in the tunnels of an abandoned mine lurks a demon that absorbs the power of anything it touches: the Black Ooze. When it consumes its first human male, it acquires both intelligence and ravenous sexual desire, much to the distress of a sorceress who mistakenly enters its domain. The heroes who seek glory and riches in these caverns are about to learn why monsters should be feared!