The Ritz Series are a group of oneshots and a short manga series of four chapters done by mangaka Hideki Ohwada. It focuses around Saki mangaka Ritz Kobayashi. A single manga volume was published on March 25, 2016.
The stories revolve around Ritz's attempt to find her father by writing a mahjong manga and the trials that she faces while doing so.
Takeshobo Magazine Building
This is were Tsujino and his underlings reside. This place is most likely a front for their real buisness.
Place where Achiga was based upon. Ritz looks here for clues to her missing father.
A mountain in the Hyogo prefecture where Aguri Igarashi and her pet raccoon Leonardo reside.