Is a rental item or can buy?

[near forge]

I ask why I see this items on blue square and plus actually I see many outfit I want buy from.previous events but looks like weird to me...can I buy this stuff on cheapest price and keep it permanently or is a rent?

[wide tangle]

"Rental Period 30 Days"

all the blue outlined stuff in shops is a rental

[rocky quest]

Clearly says it's a rental. You can't keep it.