Psychic Detective Series Vol. 5: Nightmare

The psychic detective Katsuya Furuyagi is finally able to enjoy a peaceful life with his sweetheart Rieka. But a strange nightmare begins to haunt him. He sees an unknown young woman locked in a secluded castle, begging for help. One night, the nightmare takes a different shape - the woman turns into a miraculous creature as Furuyagi enters the castle. Knowing that his unique psychic skills allow him to communicate directly with people's minds, Furuyagi begins to wonder if the nightmare has anything to do with reality - which he will find out soon enough.

[From Moby Games]