

I did a double-take, but it looks like [_Tanakeda_ volumes 13 and 13.5 are to
be released
simultaneously](https://twitter.com/ganganonline/status/1170895140354834432).
Volume 13.5? A decimal volume number? I mean, I've seen decimal chapter
numbers in _Nichijou_ , and decimal game series numbers in _Touhou_ , but this
is the first time that I've seen a decimal volume number...

[![田中くんはいつもけだるげ 13巻＆13.5巻 2冊同時発売
特集！！](https://i.stack.imgur.com/OsYTc.png)](https://twitter.com/ganganonline/status/1170895140354834432)

According to the Tweet, 13.5 is going to be some kind of memorial book. Is it
known what kind of content is going to be in this book? Is there some kind of
special occasion that prompted the release of this unusually numbered volume?


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question
tanaka-kun-is-always-listless
Tanaka-kun Is Always Listless has a decimal volume number? Volume 13.5?