The plot is stupid.
The part with the hippos was stupid, the hippos could easily injured MC and/or any of the girls.
Leaving Fuuka was a stupid move if you would stop once she becomes a hostage.
Using Io as a hostage is the stupidest part.
The enemy don't really need the girl alive, and they definitely don't need MC alive.
The enemy has more than enough leverage because all these girls are potential hostages.
MC is severely outnumbered and outgunned.
They could even ram MC with a car if he try to escape.
Human can't ever hope to outrun a car in savannah.
There's no way MC would be able to survive this.
Which means that the author will force the plot.