Takasugi-san Chi no Obento

Takasugi Harumi is a 31-year-old man. Even though he has a college degree, he is unable to find a job. One day Miya, Harumi's aunt who is like a sister to him, suddenly dies. Harumi's 12-year-old daughter, Kururi, has no one to rely on now that her mother is dead. Harumi has to take care of Kururi now but her heart is kept closed. "Obentou," a lunch box, gives them a reason to get closer to each other. Each lunch box has their feelings, love and heart in it.
(Source: MangaUpdates)
~~ Adapted from the manga series "Takasugi-san Chi no Obento" (高杉さん家のおべんとう) by Yanahara Nozomi (柳原望).