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I didn't count the chapters and they weren't clearly marked, so I just assume that 30 was the last chapter of volume 5.
It was a nice read overall with funny scenes. And I really loved the ridiculously drawn expressions of Hanabi.
But sadly some plotlines were never really followed up upon and some thing never fully explored. Like more background for president Yoshitomo. Why he did what he did with Yasuaki when they were kids. (How he turned the girls against each other.)
Or what happened to the parent conferences? She couldn't reach her father and didn' t want to ask her mother. I expected that there was some story there that would be explored later on, but that never happened. I think the story lacked a bit of depth.