Nekopara EXTRA Koneko no Hi no Yakusoku

ネコぱらEXTRA 仔ネコの日の約束

About half a year before the opening of the patisserie, La Soleil where the catgirls work with Kashou. Back when Chocola and Vanilla were still kittens when they first arrived at the Minazuki household and before they opened up to the other catgirls. (Source: Official site)