PLOT TWIST! Just a theorie though
Actually Manaka-kun is the real villain! I mean he was the first one to find the mobile phone und now he suspects there is a tracking app on it. That's quite suspicious! Maybe thats also the reason why sensei wants him to stay away from her.
But maybe Manaka-kun really just wants to help her und I have the rotten and twisted mind ( ̄∇ ̄")
I mean wouldn't that be quite more shocking than just sensei being a twisted one? But thats just my opinion ╮( ̄▽ ̄)╭
http://www.mangago.zone/read-manga/nichijou_climax/uu/00268c4338b4af43d96caaae896422ad_chapter-3/pg-33/
I had such a huge shock at first when I read ch 3, i thought the black speach boxes were the semes' thoughts, so i'm soo happy it wasn't (≧∀≦)
This Manga was really wholesome, i really love how caring und nice the seme was ε=ε=(ノ≧∇≦)ノ
How much did you cry? Because I did a lot ╥﹏╥