School Uniform Yankee Back Change Button

Please read my profile before purchasing!
These are the inner buttons used to fasten a school uniform jacket!

Stylish buttons with delinquent messages coated in epoxy resin!

There are 4 types, each with 5 buttons (1 set)!

The first type is...
   A black skull pattern with one red skull.

The second type is...
   愛・死・天・流・夜 (Ai Shiteru Yo - I love you)

The third type is...
    極・悪・菊マーク・連・合 (Goku Aku Kiku Mark Ren Go - Extreme Evil Chrysanthemum Mark Alliance)

The fourth type is...
    The characters 龍神 (Ryujin - Dragon God) and a dragon illustration.

Please check the photos for details!

These are new and unused, but the backing paper is old, so I've listed them as close to new.
Please refrain from purchasing if you are sensitive about such things.

How about them as a hidden fashion statement?

They're nostalgic items from the Showa era (lol).

Perfect for the start of the school year!

Hey dads!
Aren't these nostalgic?
How about getting them for your son?
You can even share them with your son's friends!

I'm not considering selling them individually at the moment, so please purchase as a set!

I'm open to slight price reductions, but only for those who can negotiate reasonably and see the negotiation through to the end.

If you are considering purchasing, please comment before buying so I can confirm the item's availability.
Thank you!