A technical failure. There's no save feature, it is made in an engine not designed for VNs and it crashed on me in the middle of the demo with NO SAVE possible. The fact that the "No save" thing is intententional with only end-of-day autosaves after lenghty  text is a terrible design.
The story is mediocre and does not overshine the basic mistakes made, including many spelling mistakes and typos. It seems interesting, but not enough to put up with whatever amalgamation of systems the game runs on. Ironic, considering the protagonist's nature.

A lesser complaint: let the player change the last name. "Dark" is way too edgy for a halfway serious story. Especially "Kage Dark".