Shut-in Magician? ~A story that’s not only fluffy but heartfelt as well~ (Associated Names)

An Ojii-san was reincarnated thanks to a kind Goddess. He wished for a 「healthy body」. However, for some reason he received the cheat ability to use powerful magic instead! Even so, he rarely used the ability. When he ―― Shiu, turned 11, the Goddess appeared and informed him ――。”Become an adventurer and enjoy life.” He…