This post is from all the reading I've done over the weekend, so there's a lot of stuff here
Not much else happens over the summer, Bethly goes back to Canada for a while and she and Yukito send each other snail mail. Once summer break is over, they go back to doing their "one-room classroom" thing.
Eventually everyone ends up looking at Bethly's sketchbook and Hina notices something
A few time skips later, without a ton of particularly notable events, and it's winter again. Time to plan an activity for the winter break and it looks like it's going to be skiing
They ended up going there, the absolute madmen.
Later that day
Pretty much immediately after that we skip to april when the next school year is starting.
After school the next day, Yukito and Bethly get pancakes at his mom's cafe.
A few days later after school, Yukito and Bethly go back to the mountain because that's the only place where there's any snow left and they want to make a snowman.
As of writing this I've read 50 hours of Ginharu... at this rate I might get to the end of a route before 5000 hours!