Toshiki Okada (岡田 利規, Okada Toshiki; born July 3, 1973) is a Japanese playwright, theater director, novelist, and founder of the theatrical company chelfitsch. He is known for "his use of hyper-colloquial Japanese and his unique choreography."
Source: “Toshiki Okada”, English Wikipedia (CC BY-SA 4.0), excerpt