He just went and casually called her his fiancée. This guy's rizz is something else
(kinda surprised Alya didn't turn red at some point, or maybe that's bonus chapter material)
Ah lovely, seeing this in the anime instantly in the second episode, I was positively surprised this wasn't some classic love triangle / harem / whatever story and got convinced to give this a read (no, I'm not here for incest smh). Surprised to see this reveal that late, in comparison. Love to see the adored-by-everyone student council member being revealed as his otaku sister