https://www.dlsite.com/maniax/work/=/product_id/RJ253712.html
https://www.dlsite.com/maniax/work/=/product_id/RJ303964.html (English)
Gameplay is pretty much over-the-top action RPG (kinda like Zelda) but with Dark Souls-ish element into it.
There's quite a bit of mechanic in the game, such as...