i don't ever write reviews but this show is simply beautiful. It is a journey of overcoming your past self, learning to love and most importantly believing in yourself. A beautiful pure romance anime that I think is going to be on my mind for a long time.need to track each node’s indegree and ensure no node has indegree greater than one. Third, a valid tree must have exactly one root, meaning exactly one node with indegree zero. Finally, all nodes must be connected, which together with these conditions implies exactly n−1 edges.