Play as a Dou and Travel Across the World

Ps: This is a book that a novice author has just started to write. I suggest you read it without thinking and try to finish it. Thank you. Is there a system, single heroine or no heroine? The worlds I plan to visit include Love Apartment, Pokemon, One Piece, the anti-Japanese drama - Spell Return, Chaldea, Genshin Impact... (I'll see if I want to add more later).