Sounds like a recipe for a excellent time. A very good variety of Hentai fall underneath this. These are also standard onomatopoeia for orgasmic moans, so the title, in isolation, appears like it really is about a person who moans all the time, a little something that will work far better in a hentai collection. The speaker is Adachi, the real killer, who the protagonists confront in the episode in problem.