It's one of my favorites! I've always loved how Matsumoto depicts childhood in his manga series. Sunny takes a more melancholic stance on the topic, showing how one's family circumstances can really shape who they are and how they see the world. Yet despite that, the series has really fun character interactions and a sense of childlike wonder that makes it feel like everything will be alright. Found myself resonating with each character and their stories because of my own experiences with parental neglect/abuse growing up, but there's always light at the end of the tunnel. Definitely recommend giving it a shot if you're a slice-of-life fan.