Did you select a speed and start with W? There might be some issue in some browsers... I only tested it in Brave and on Desktop.
Isekai is just "other world", not just reincarnating but also going to different world is valid (Like in "Isekai no Seikishi Monogatari" or Escaflowne) - reincarnation just got more hyped lately (Yes Truck-kun hits people since 1963/1982...)