Huffft, seeing this on my free time, since my last phantom trigger was this ones strongly talking just about Shishigaya Touka and Kumashiro Megumi. they booth had same spotter that just recentlywant to said that this ones worth to see, since grisaia series seems goes to phantom trigger now. and they somewhat have connection on original grisaia series, so if u interesting you can watch it, from how it seems, i think they will had "suprise" sub story like this more in future, so i sure this ones really worth to see before you guys watch the real series around this year (i mean the series, while this ones "stargazer" was movie)
and as always, Style of animation was wild. detailed, bold and "immersive" enough to enjoy if you like somehwat good animation on anime.