Weekly Shōnen Sunday
From 2000 to 2001, Adachi published a fantasy romantic comedy series in "Weekly Shōnen Sunday" titled "Itsumo Misora". His next longer series was the boxing romantic comedy, "Katsu!", published from 2001 to 2005 in "Weekly Shōnen Sunday". In 2005, "H2" was adapted into a live action drama series aired on TBS in Japan, and "Touch" was adapted into a live action movie released by Toho. He also began his manga series "Cross Game", serialized in "Weekly Shōnen Sunday". The following year, "Rough" was adapted into a live action movie, also released by Toho.