Responses
That’s the one shot...
Are you asking if it’s an actual book?
Yes
I don’t think it is. It’s probably only the one shot. But it might be...
There is a side note saying that the beginning of story of those two belong to the previous published 'Retro BL' Anthology.
http://www.mangago.zone/read-manga/tachi_neko_soudatsu_bl/mdx/d_v-1-chapter-6/2/ what is this manga ??