I'm surprised how you could write so much about it without any spoilers :o)
I'm not a big fan of slice of life, but at first I was captured by exceptional visuals, so I thought I'll give it a try for two or three episodes. And I'm glad I did. I ended up waiting for each new chapter. For a slice of life there is actually a lot of action and mystery. My favorite was probably the episode when they visited some Honda museum and repaired racing motorbike, but there are more stories that left emotional impact.
Overall - recommended!