Celeste's manga / #kindergarten teacher(1)

[ Spin-off, Hate to Love Relationship] - a spin-off from (Now I wish this has a second volume too) Started with a hateful relationship. He was always blunt and straightforward towards other people other than childrens. Then there is Yura your common salary man taking care of his sister's child, a student where Yutaka was working. Yura is inlove with his coworker, something Yutaka realized. This is when they started to stablish their relationship. (Also, the kids are now grown up, and as expected they're still inseparable)