If you're referring to Takagi-san, yes, it's canon in the same way, even Bokuyaba has a light novel that's also canon.Is this canon like the teasing girl one?
If the last page reminds you of something, it is the last page of chapter 161 of The Dangers of My Heart (aka BokuYaba, the main story)Kyo finally turning the tables on his onee was worth all the cringe.
that's chapter 47 of BokuYaba, from the first date of Yamada and KyoutarouDeja vu, hiding in the dressing room from Kana-chan.