Saiyan: Rampaging Across the Multiverse, Starting with One Punch

A veteran driver falls off a cliff after failing to show off.

By a twist of fate, he's reborn as an ordinary Saiyan on Planet Vegeta.

He'd planned to tag along with Kakarot's old man and become a warrior,

but was struck down by the space emperor Frieza before long.

He somehow survived,

only to run into some unknown thing that wanted to climb on his head and take a dump.