I Was Transported Inside My Novel

Yoshihiro Takagi is a shut in who inherited his grandfather’s home and money. He loves to write a novel to pass his time, a novel called Grinfall. The novel takes place in the same world created by his grandfather, he was a novelist and manga author. One day when starting a new volume set after a time gap of 1000 years after his original setting, he writes a rather interesting line and somehow gets transported into another world. That world is none other than the one titled in front of his novels.