Oh! great, whose real name is Ito Ōgure (大暮維人 Ōgure Ito) is a Japanese manga artist most recognized for the manga series Tenjho Tenge and Air Gear. In 2006, he received the Kodansha Manga Award for shōnen for Air Gear. Apart from working with manga, he designed some of the alternate character outfits in the PlayStation 2 version of Namco's 3D fighting game Tekken 5, and a guest character in Soul Calibur IV named Ashlotte. His pseudonym "Oh! great" is a play on words. His pen name, written in Japanese order, is "Ōgure Ito", which is pronounced similarly to and can be romanized the same as the Japanese rendering of the English words "Oh great," ōgurēto. Furthermore, "Oh" can mean "king" in Japanese, making it possible to read the name as "the great king".

NisiOisiN 1981年生まれ。2002年に『クビキリサイクル』で第23回メフィスト賞を受賞し、デビュー — 1981年生，立命館大學肄業。 2002年以《斬首循環-藍色學者與戲言跟班》獲得講談社第二十三回「梅菲斯特獎」並以同作品出道。 2005年之前，除了在出道作為基礎延伸的「戲言系列」之外，另有「世界系列」、「人間系列」等多種嘗試挑戰之作。 2006年出版的「物語系列」在2009年夏天電視動畫化之後，原作因富有獨特韻律節奏的文體與充滿思考趣味的世界觀，備受文壇矚目，在日本年輕讀者間蔚為話題，並被視為日本〇〇年代文學代表性作家之一。其奔放旺盛的寫作意欲，年紀尚輕便已著作等身。 2014年推出「忘卻偵探」系列，集過往創作之大成，《掟上今日子的備忘錄》甫一上市便深獲好評，並於2015年十月影視、漫畫化。