My bet is hinoka think they are already dating, but tsukushi is really stupid and didnt notice that, re-read the firsts chapter with this in mind made me see things I didnt had catched before, poor hinoka .·´¯(>▂<)´¯·.
Wow, I wonder why she looks dead when you mention boyfriend but is the exact opposite when you she wants to hang out with you, definitely not because she's gay af, nope not all