Taking bets on Yukibara cruise-liner setting sail, Nobara going to Italy to study, inviting Yukino to Italy to celebrate Nobara's birthday and the plane crashing on the way there. Tragedy tag gets stealth-added. It's what I'd do.
@Picks Genre change? Fine. For me, the plane "slips" into another world and this series becomes a survival story among the plane passengers. Yukino then struggles through 20 volumes' worth of survival and interpersonal drama, epic adventures, desperate heroism, tragic losses of dear companions, and ultimately towards final happiness. A major mid-story twist involves Nobara somehow showing up in this new world, leading to a reveal that her identity is not what it seems...but they still get their happy ending.
Lol the ship will sail at full speed with full tank engine whether nyandare like it or not because squiggles is the captain xd. And we are the mini battle ship beside on it.
Will she be able to relay her distinctly romantic feelings? Or will this be a confession of "love" that can be read either way: romantically or platonically? Istg we've been given so many of these "romantic" moments by now and none of our MCs seems to catch on.