Usually there's more than just two chapters per volume when it's shoujo/josei, but in this case both of the chapters in the first volume are around 80ish pages so they're quite a bit longer chapters than what you'd normally see in shoujo/josei mangas (most shoujo mangas I have read or translated...
It's a flashback of when Mashimo and Kikka were around 22 years old - Kikka had collapsed outside when as she was struggling with her parents' deaths and with finding work. However, the way the panels are set on the page makes it look like Mashimo went for a run after speaking with his dad.