Summertime Saga version 15 is now out with the new teachers story line. If you have been following me on my YT channel, you already know that I have been playing it and had completed most of the quest from the four teachers.
I played with the cheats on so as to easily create a guide on how to accomplish stuff in the game. If you are playing STS and got stuck at some point, I recommend watching my videos showing how to find items necessary for finishing specific tasks for Miss Dewitt, Miss Bissette, Miss Okita and Miss Ross.
Here's a playlist of my Summertime Saga Teachers walkthrough which you can reference if ever you got stuck at specific point in the game: