|I just want to say that you shouldn't read this if you don't like it enough to keep reading it for the characters themselves. It's not supposed to be a plot-driven manga. What I really hate are when people demand for a manga to have some random element they like, and then when I point out it has far more of that element than anyone would expect a manga like this to have, that's still not enough for them. Airantou is gradually turning into just as complex an island as the one from "Lost", but don't expect betrayals and submarine explosions and dramatic deaths, it's a love comedy!
That said, the plot heats up with a long arc that starts around chapter 105. It starts with the festival, and transitions to another dramatic and action-filled arc. That arc is over by chapter ~130 after some big revelations, impacting Ikuto's life on the island and setting off character development all around.
Examples of questions that are answered by chapter ~130:
Spoiler (mouse over to view)
- What's been going on outside the island this whole time?
- What happened to the men who were lost at sea?
- Ikuto's past--Why does Ikuto get nosebleeds so easily? Why is he so adamant about everything having a scientific explanation?
It's also a must to read the flashback arc about how Suzu's mother and father became a couple. I forget what chapters those are. Just read everything, of course.