Here's a story about a 35 year old hikikomori named Haruo who lives with his mom.
Haruo quit his job and became a hikikomori because he was bullied at his first job when he was 25. Mom is worried that when she dies her son will not be able to live as he has no income.
Haruo's older brother comes over saying that he built a new house, and wants her to live with him. Mom does not agree because she would have to leave Haruo.
One day Haruo is on his computer when a young girl enters his room carrying his meal. She says that she's his mom who grew younger after losing consciousness. Haruo doesn't believer her and thinks it's a prank.
Haruo then begins wondering if he's relying too much on his mom, and if he should change.
His mom then enters saying she doesn't blame him for not believing her. Finally, she offers him sex and become his wife so they can live together.