[@Delta44] It's far more lighthearted, most of the time, but when the plot moves forward, you can tell it's getting more serious. I dunno if I'd call it "psychological-mystery" like Chaos;Head, but I feel like I can say it's similar. The main characters are a ragtag group of high schoolers, ranging from stern and serious to excessively introverted. There are definite references to the previous shows, including quotes and characters. Though I haven't seen the other two, I can definitely say I love the show, and I'm pretty sure you would too. Hope I didn't spoil anything on my end.