Sokuochi Succubus Rumiru-chan -kusozako Ma-ko N... Review

It features a "loli" protagonist aesthetic, focusing on a character who appears young despite her supernatural status.

If you're looking for more details on the developer or where to purchase it, check out the Sokuochi Succubus Rumiru-chan page on VNDB for a full list of staff and related tags. Rumiru | vndb

The term "Kusozako" (trash-tier weakling) refers to her lack of mental fortitude; she is easily overwhelmed or "instantly defeated" (Sokuochi) by circumstances.