Right, so in chapter 3 when Masaki is suffering from his heat cycle, Yuuki said he didn't really understand anything about it. Since he is a university student it's clear he would already have had a heat cycle if he were an omega. Idk why I just assumed he was an omega an ignored this part lol. I'm too lazy to check the rest in search for bits that could be confusing, so whatever.
We still need Matsuo and Yuuki's full volume.
They said he was a beta from the beggining
They said he was a beta at the beggining **
Wait, what? I was certain Yuki was an omega o_o I'm sure it was said at the beginning D: ima go check the first volume lol