A "rift event" occurred around the world at the same time, randomly transporting 1% of the population to a different world called "Iseland". The selected person has a survival system implanted in his mind and needs to survive in a testing area where monsters are rampant for 30 days. Those who succeed will become "Dual Realm Walkers", able to travel freely between the two realms, and gain professional abilities granted by the system.
The protagonist brings his child to another world, while his wife does logistics at home. When science and magic collide in the two worlds, a father's wisdom and courage to protect his daughter will eventually rewrite the fate of the two civilizations.
