I'm The Only One With Cancer - Chapter 154: Final Spar I

Crippled by the loneliness of life and now the sudden death of the only person that treated her as a human. With strong feelings, Megumi scorn's life end abruptly as she wished to re-join her friend Eric, in death... Only.... She wakes up in the same room feeling an eerie change to her surroundings.Behind her stands a Reaper! Revealing her death to be true, she now finds herself separated from Eric in the world of Purgatory. A world of death where demons are born, the reapers sow and the sins of man become alive!

The well-known and recognized throughout the Stern continent, strong and mighty, as well as the unique Wizard of magic cures, the most outstanding genius of the whole continent, Jason got into the flow of time, back in the uncivilized era during the first failed experiment, 3000 years ago. This was the period when the magic healers didn’t exist. How will Jason apply his knowledge in this backward era, wherever he reach the peak of glory?

- Description from Novelupdates

One day, I woke up only find out that I’d become a Demon Lord, an individual responsible for protecting a dungeon. The world I’d been spirited away to was one filled with violence. Gigantic monsters wandered through it and competed with each other each and every day for the right to survive. I had no choice but to strengthen my dungeon’s defenses in hopes of living another day—or at least that was what I’d thought. For some odd reason, I instead ended up spending my days in relaxation and bliss.