Returnee's mom

Kagura, a single mother of a son, who for the last 10 years has created nothing else but hardships and disappointments for her mother. Kagura whose friends left her for not believing them and disowning her failure son is falling into depression...

However a sudden morning, when Kagura is thinking of her current lifestyle, she could hear her son waking up screaming and runs to check on her, he's crying and when Kagura asks what's wrong? Her dear son hugs her, she could not hear anything after that.

Because what she did not know her son had experienced next two hundred years into the future and had now returned and planned to live a different life.