Is there any special reason for the Donyatsu shoutout in Kogane's backpack?


In _Bubuki Buranki_ , Kogane has a Donyatsu backpack. Written on it above the
face of the pastry cat are the words "Not Donyatsu". Is there any special
reason (same author, authors were friends, same publisher) for that shoutout?

[![Dat backpack is
'nuts](https://i.stack.imgur.com/EPYDf.jpg)](https://i.stack.imgur.com/EPYDf.jpg)
[!["Not Donyatsu"](https://i.ytimg.com/vi/1aCdK-
APHiE/maxresdefault.jpg)](https://i.ytimg.com/vi/1aCdK-
APHiE/maxresdefault.jpg)




The author/illustrator of _Donyatsu_ , [Kozaki
Yuusuke](https://en.wikipedia.org/wiki/Y%C5%ABsuke_Kozaki), is also the lead
character designer for _Bubuki Buranki_.

