Harry, the alien, is back on Earth but doesn't remember who he is and only Asta can keep him safe.
Resident Alien S2E1 Screenshot
Overly focused, it's far from the time to rest now
Debates growin' 'bout who they think is the best now
Took a while, got the jokers out of the deck now
I'm holdin' all the cards and dudes wanna play chess now
Summary:
Harry, the alien, is back on Earth but doesnt remember who he is
and only Asta can keep him safe