The plot: take an innocent man and woman, somewhat naïve, very nice, and not fashionable, to show that love is about more than sex.  Have them marry, then let them grow.  I know some people like this -- married young and very happy.

Money buys influence and protection.

As an aside, the coordinates had her phone's position pegged down to 31 cm of longitude, and a slightly smaller amount of latitude.

There are many things that can be compromised, but marriage without ideals at the beginning will grate on the party that is idealistic.

Kuga and Mikumo each have half of the answer, but they will improve after each round.

Simply trying to please your spouse.  It's a good thing.

The waifu shows up.

Things change.  You're chasing your competitor, then someone starts chasing you.  This can apply to both sports and love, as this chapter shows.

Well, at least they have gotten to the game.  I can't tell if the Principal is merely shamed or shameful.