Kiriyama mode: Tinder.
Ok, unless we got caught by surprise by the plot, the lucky guy will be his teacher, and it was foreshadowed since he met Akari for the first time, that time when Rei invited the sisters to visit his school.
- interesting how that little move was a complete turning point in their lives:
- in order to be approved, Hina got more mature, focused, and had the longest time togheter with Rei.
- being near Hina in the school, Rei discovered a jealousy that he was not aware he had about Hina when she was falling for Takahashi.
- and now, there is a great chance to this also helps Akari's life.
Well, but we dont know, all foreshadow can be just a fooling move from the author, and in the end Akari and Hina fall in love for other guys.