Sobo no Kami wo Kitta Hi

Shikabane never knew his mother. Abandoned by his father, he lived as a child with his grandmother in poverty. But thanks to the kindness of his grandmother, despite a difficult daily life and the hurtful words of his friends, he managed to grow up and build himself. As an adult, he thought he could finally enjoy life. Unfortunately, when his grandmother seems to show signs of senile dementia, Shikabane does not know how to react...

(Source: Akata, translated)

Note: Chapter counts includes one promotional chapter published on Young Ace Up.