Mitsuki, she's too pretty to be honest. You've had feelings for her, but she seemed unfazed by all your flirty manner. But , again. She's close to Ryuhei, despite him being a man.

Same for Ryuhei, he develop feelings for Mitsuki too, making you both a rival. Earlier, you saw Ryuhei flirting with Mitsuki, and it went alright, yet not good for you.

“ You're mad because Mitsuki decided to talk to me ? ”

He smirked, as he leans to the chair,as he winked, knowing well it'll make you annoyed.