[Shiroi Hane]

Originally Posted by CrowKenobi

From episode 15:

Spoiler for poster id:

Someone else pointed out the Kiddy Grade poster in Kona-chan's

Spoiler:

Specifically the poster is the for the Ignition movie (which was shown in Theatre Shinjuku in April of this year, and it is probably no coincidence that this episode was set in April). You can see the poster itself, in-situ as it were, here