Mitsuru Adachi (あだち 充 or 安達 充, Adachi Mitsuru?) is a mangaka born February 9, 1951 in Isesaki, Gunma Prefecture, Japan. After graduating from Gunma Prefectural Maebashi Commercial High School in 1969, Adachi worked as an assistant for Isami Ishii. He made his manga debut in 1970 with Kieta Bakuon, based on a manga originally created by Satoru Ozawa. Kieta was published in Deluxe Shōnen Sunday (a manga magazine published by Shogakukan) .
Adachi is well known for romantic comedy and sports manga (especially baseball) such as Touch, H2, Slow Step, and Miyuki. He has been described as a writer of "delightful dialogue", a genius at portraying everyday life, "the greatest pure storyteller", and "a master mangaka". He is one of the few mangaka to write for shōnen, shōjo, and seinen manga magazines, and be popular in all three.
His works have been carried in manga magazines such as Weekly Shōnen Sunday, Ciao, Shōjo Comic, Big Comic, and Petit Comic, and most of his works are published through Shogakukan and Gakken. He was one of the flagship authors in the new Monthly Shōnen Sunday magazine which began publication in June 2009. Only two short story collections, Short Program and Short Program 2 (both through Viz Media), have been released in North America, though Viz is scheduled to begin publishing Cross Game in October 2010.
He modeled the spelling of あだち (rather than 安達) for his family name after the example of his older brother, mangaka Tsutomu Adachi. In addition, it has been suggested that the accurate portrayal of sibling rivalry in Touch may come from Adachi's experiences while growing up with his older brother. Adachi did the character designs for the OVA anime series Nozomi Witches, so he is sometimes incorrectly given credit for creating the original series.