[mizushima] Keiko Shibata x Katsura Neko Cats with Wigs mini letter set

Do you recognize the signature style of this illustration? It's the work of Keiko Shibata — most known for her creation of Bread Thief! This is Katsuro Neko featuring cats in fun wigs!  

• 12 sheets total (2 designs x 6 each)
• three (3) mini glassine envelopes

made in japan