The Lowest-Ranked Hero Has Returned - Chapter 255

This is a story about the protagonist getting the system, going crazy in the biochemical apocalypse, producing aircraft and tanks, destroying zombies, saving good people and killing bad people.

- Description from novelbuddy

[A Slime Monster Evolution LitRPG]Our protagonist was set for what should have been a good life; born as a noble prodigy with a talent for Dimension Magic.Unfortunately, they did not get a chance to live that life of adventure, wonder, and accomplishment as they died an early death.However, a kind(?) grandpa gives our protagonist a choice for the next life; instead of having a generic life starting from zero, why not join one of his experimental reincarnations not yet approved?However, the experiment was a lot... Slimier than expected.What to expect?- Monster evolution and mutation- Traits and skills- Collect-a-Thon- Lots of experimentation- Adventurers and Dungeons- Deception and Disguises- Magic- Lots of slime

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.