Hitoribocchi no Kimi ni (1998)

Hitoribocchi no Kimi ni 1998 / ひとりぼっちの君に 1998 / ひとりぼっちのきみに , For lonely you , You're not alone

His mother having left him, nine year-old Yudai is forced to live alone and steal from a local convenience store in order to survive. Pursuing the wily thief to get back the stolen merchandise is the first act on the job for newly-arrived Shintaro, manager of the convenience store. Shintaro soon learns of Yudai's predicament and decides to take him in. Becoming his new family, Shintaro and his assistant, Satomi, soon discover that caring for a young boy who has such a troubled past and who is accustomed to fending for himself may be more than they can handle. (Source: DramaWiki, TBS)