I think all of the adults really should know things already, and at the very least are displaying willful ignorance with regards to Akira's behavior.
- Tsubasa and Haruka straight up know a lot of what he's doing or has done.
- Osako knows he's fucking Ayane.
- Osako has basically said as much in front of Wakana (while also on a "double date" with Sensei and Maya), and Wakana has heard rumors about half of the class.
- In front of Maki, Akira has repeatedly demonstrated his attraction to teenage girls and shown that he thinks about Makoto sexually. She'd have to be the most oblivious person on the face of the earth to not suspect him when she realizes Makoto is having sex. I had some screenshots on this in my Chapter 1 round-up, here's a few more from Chapter 2 so far:
- Imani sees him interact daily with several teenage girls (not known for subtlety or discretion) that he's boning.
- Rika lives in the dorms that he visits late at night and has repeated sexual encounters in.
- Niki is aware of aspects of Sensei's relations with his students, but is unwilling to think about them
- From their first acquaintance, Yuki is convinced that he's fucking Yumi.
- Sara might have the most excuse for not knowing, but she's at least seen him flirt with his students in her bar. Edit: and was present when Ayane called him by her lust name.
Unless you're willing to suspend your disbelief to a really extreme level, it's easiest to just assume that he has some sort of supernatural protection, either preventing people from reaching obvious conclusions or making them think that what he's doing is acceptable.
There's definitely some less than realistic plot magic going on. Oddly enough, and this may be a weird take, I think Yuki might have the worst reaction. Or the best, it's kind of hard to say. I just feel like there's some dissonance between her being weirded out by his relationships and suspecting something weird, but not actually believing he's gone all the way with it, more-so just fucking around and being a weirdo. She's the most willing to tell someone they're fucked up and to choke a bitch, and I feel like she'd have pushed much harder if she
actually thought he was fucking Yumi and others deep down, and wasn't just kind of a creep. (I could be wrong or forgetting scenes that contradict this.) Her past and attitude towards bad decisions like that lead me to the think she'd be the most angry, at least.
Either that or she'd be like "Fuck, man, I didn't think you were actually putting it in highschoolers." And that'd basically be it, you can never really be too sure.
Edit: I can't type good
