This isn't a harem. This is a story about a guy who gets reincarnated as a trap and buys an old lady elf slave who teaches him stuff and they explore dungeons together. She's old and frail but magically she's overpowered.
This isn't a harem. This is a story about a guy who gets reincarnated as a trap and buys an old lady elf slave who teaches him stuff and they explore dungeons together. She's old and frail but magically she's overpowered.