also: ミステリ · ミステリィ
noun
mystery; mystery fiction; unexplained matter
Katakana noun for a mystery, especially a mystery novel, film, drama, or genre; it can also refer to something unexplained or puzzling.
週末にミステリー映画を見た。
I watched a mystery movie over the weekend.
彼がなぜ急に辞めたのかは今も
Why he suddenly quit is still a mystery.