Responses
YUP I'M RIGHT, it says so here https://www.mangago.me/read-manga/mimasaka_kun_to_mayoeru_kobuta/uu/mpn_chapter-2359979/2/
beta
YUP I'M RIGHT, it says so here https://www.mangago.me/read-manga/mimasaka_kun_to_mayoeru_kobuta/uu/mpn_chapter-2359979/2/
To clarify, I think this is the main story and the one that came out first. At the first page it said that this is the author's DEBUT comic. If I'm right, that will explain why Mimasaka-kun look different here.
Mimasaka-kun to Mayoeru Kobuta is the spin-off, I think, because the drawing is significantly better and looks newer