Overpowered by Love! The Grandma Yukari Gold Tooth Gauntlet!

Godai wakes up to rustling noise in his room, when he demands Yotsuya stop it, he opens his eyes to see his Grandmother. To his surprise, he was supposed to pick her up, but totally forgot. She wastes no time in scolding him, and embarassing him in front of Kyoko. When she learns from the Manager that Godai has a girlfriend, she insists upon meeting her.

Synopsis excerpt via Kitsu.