Riichiro Inagaki(稲垣理一郎Inagaki Riichirō), born June 20, 1976 in Tokyo, Japan, is a Japanese gensaku-sha (manga writer). He's best known for writing the manga Eyeshield 21, in collaboration with artist Yusuke Murata. Eyeshield 21 was completed in June 2009. He won the 7th "Story King" section in Weekly Shonen Jump No.51 2001. His previous works include Any number of times on the 13th of June, Square Freeze and LOVE LOVE Santa, which were published in Big Comic Spirits.