From the introduction:
In all the world, is there anything else that can bring a smile to all who catch a glimpse? What do young maidens so ardently protect from breezes, puddles, stairs, and peeking eyes? Lo! The holy grail hidden beneath skirts around the world: pantsu!
Ahem. If you love pantsu (or even if you don’t!), this is the supplement for you! Here, you can make as many pantsu as you like, as long as you have the pantsu points to pay for them.
Please note that any additional pantsu points granted by an option can only be spent on the set of pantsu you’re applying it to. Soooooo no hoarding a warehouse full of of granny panties in exchange for hundreds of legendary-class 5000 point pantsu, you weirdo.