ぼっちだけど核シェルターがダンジョン化したので脱出します (Associated Names)

There is only one person inside the nuclear shelter, and inside it, the hibernating protagonist had just awoken. The world he had woken up to is one where 100 years have passed, becoming a different world altogether. The nuclear shelter that the protagonist was living in had been affected (TN:by radiation?) and transformed into a…