You are part of the Straw Hat Pirates crew, and one day suddenly several strange creatures mysteriously appear on the deck of the ship. Seeing it from another perspective, in yet another of his resets Chara ends up sending some of the monsters to another world. Sans: Hehe, where are we bro?

Papyrus: Nyehehehe, I have no idea Sans! I'm shaking with fear!...

Undyne: what the fu- Before she could finish speaking, Toriel covered her mouth.

Toriel: Don't say these things around the child!

Alphys: Hehe... well... this place looks like one of the animes I watch... eh... ...

Asgore: Alphys, Have you figured out any way to get back underground?

Alphys: no...

Mettaton: Oh! Screw the Underground, we're finally free from that hell, and now I can show humanity the star they've been missing all this time! Oh Yees~

Muffet: Awhahaha~ I'll finally be able to sell my sweets without people complaining about the price, and I'll finally be able to help free the spiders from the ruins awhahaha~

Papyrus: Your sweets are absurdly priced, 9999 for a donut is a steal Nyehehehe!

Flowey: But what the hell is going on here?? what the hell!

Frisk: :... "You look around, and notice a bunch of strangers around you... this fills you with DETERMINATION"

Meanwhile from the pirates' point of view

Luffy: New friends!!

Zoro: who the hell are those??

Ussop: i dont know, but in scared!!

Nami: me too the two scaredy-cats were hiding behind Zoro, while Chopper was hiding crying in Robin's lap

Chopper: m-monsters...

Robin: I don't think it's a good idea to make friends with a bunch of creatures that appear out of nowhere!... she says unconcerned about the situation, reading a book with Chopper on her lap

Franky: Robin this is SUUPER!! right.

Brook look at the skeleton duo Brook: It seems like I'm no longer the only living skeleton around here YOHOHOHO!!

Sanji: don't worry miss Nami, miss Robin, I Sanji am here to protect you from these evil creatures! he says with heart eyes.