Tsukushi is a vector of porori author. This vector includes spring, natural, Tsukishi, blue sky, Sprout tags. To download vector (JPG, SVG, PNG, AI/EPS types) you need to register the account and log in.
As the free account, you can download for free with some limits.
As the premium account, you can download unlimited, no waiting time, etc. Enjoin premium membership at here