Denji, Lapdog

When a Devil you don't control or own is
destroyed, gain life equal to it's power.
When Denji, Lapdog is sent to the graveyard and another creature named Pochita is also in the graveyard, instead return both to the battlefield
and meld them into Chainsaw Man. There is
another combat phase after this main phase if it
enters the battlefield during your turn, where
only Chainsaw Man must attack.