Watch something like this happen:
Tenma cries, Harima decides not to confess his feeling so soon after Karasuma leaves. Yakumo doesn't make a move while Harima's still trying to comfort Tenma. Karasuma comes back "Hey the treatment's going well I get another year".
Tenma back to going after Karasuma, Harima realises he missed his chance and goes back to trying again, Yakumo steps back now that Harima's active after Tenma because she doesn't want to interfere with her sisters relationships, Eri sees Yakumo back down and goes active again.
Happily ever reset.
FUCK!! I better be wrong and Karasuma dies like RIGHT NOW, so stuff can move.
Shit, even with Karasuma overseas, Tenma will go all long-distance relationship and everyone will be cock/cunt blocked.