also: マニヤ
noun
Refers to a person who is deeply passionate about a specific hobby, interest, or collecting area. Often used in compounds like 鉄道マニア (railway enthusiast) or 映画マニア (movie buff).
彼は切手マニアで、世界中の切手を集めている。
He is a stamp enthusiast and collects stamps from all over the world.
あの店はマニア向けのレアな商品が多い。
That shop has many rare items for enthusiasts.
noun
Describes a state of intense excitement or obsession about something, often a trend or fad. Can be used as a standalone noun or in phrases like マニアになる (to become obsessed).
最近、昭和レトロがマニアの間でブームになっている。
Recently, Showa retro has become a craze among enthusiasts.
彼女の料理マニアぶりには驚かされる。
I'm amazed at her enthusiasm for cooking.