Actually a touhou doujinshi. The main character is Flan and she's riding a scooter around Gensokyo while musing about life or something. I also remembered Alice crying over Marisa's grave, who seems to have passed away a long time ago.
Remember guys, the correct course of action when a girls' towel is falling is to jump at her and tries to lift the towel instead of averting your gaze and closing your eyes. Kudos to the mangaka for reminding us of this valuable life lesson.
It's in the middle of a forest, on top of a hill. Depending on the size of the forest and the prefecture the school is located in, I'd say a bear sighting is not that improbable.
I know mangaka would like to promote his previous works but goddamn giving a literal hentai as a recommendation to a foreigner really makes me unable to take this manga seriously. And it's even by a girl, with a very straight face. (The hentai is good btw),