Jidou Yougo Shisetsu de Sodatta Ore ga Mangaka ni Naru Made no (Ooyoso) 8760-Nichi

Nagata spent 11 years in an orphanage starting at the age of four. He, along with his two older sisters, entered a facility in the Yoshikata neighborhood of the town of Shounai in Yamagata prefecture. There, Nagata continued to live his childhood while facing the confusion about the sudden changes in his surroundings. The story plans to show how his life in the orphanage eventually accumulated into his current career.

(Source: Anime News Network)