Describing something highly specialized, obsessive, or niche; used for people or tastes who are extreme enthusiasts or for topics that appeal to a narrow audience.
彼のコレクションはマニアックすぎて、一般の人には分からない部分が多い。
His collection is so maniacal that many parts are hard for ordinary people to understand.
マニアックな映画を好む友だちがいる。
I have a friend who likes very niche (maniacal) films.
趣味がマニアックになると、専門用語が増える。
When a hobby becomes maniacal, specialized terms increase.
その説明は少しマニアックで、入門書向けではない。
That explanation is a bit too niche/maniacal and not suitable for an introductory book.