Main member of the 07th Expansion circle and creator of the popular visual/sound novel series When They Cry, including Higurashi no Naku Koro ni, Umineko no Naku Koro ni, and Higanbana no Saku Yoru ni. He also is the creator of a visual/sound novel titled Rose Guns Days, and wrote the Lucia Route of Visual Arts' Key's visual novel Rewrite. His pen name is a tribute to Reina of Final Fantasy V.
The pen name of a Japanese man well-known as the original creator for the idea of the visual novel video game Higurashi no Naku Koro ni. He is the representative member of the group 07th Expansion.
His pen name originated from Reina of Final Fantasy V — "07" in Japanese can be pronounced as "reinana", and "Ryukishi" means "dragon knight", referring to Reina's wyvern. The character Rena Ryuugu from his work, Higurashi no Naku Koro ni, comes from Reina of Final Fantasy V as well.