Chuuni Hime no Teikoku by Ushimitsu Soft - Adult Sex Game

Behind the skyscrapers which rise like castles in the old downtown area of the 23-ward Galapagos lies a remodelled love hotel, inside of which lives a self-proclaimed princess from another world, along with her guardian knight and personal maid. In reality, they are actually a gamer addict, a light novel author and an elf cosplayer. The protagonist inherited the management duties for this building from his mother and signed an extremely suspicious leasing contract, triggering the princess’s ability and making him her ‘hero’. He must now begin a chuuni life with new abilities outside of his control.