Guriko remembers when she lived by the ocean how to deal with this. You can't touch the tentacles. So...

[ She look around for a moment, before picking the tie off her school uniform. ]

Guriko will use this. Though, there's a good chance it'll sting you. [ thinking... Snapping her fingers! ] Salt water and vinegar is the way to get rid of the sting, if Guriko remembers correctly! Then you peel out any stingers left in the skin, and everything is a-okay!