Sirius: *slips on literally nothing and begs to be punished*
...Yeah, that's Sirius alright.
If Episode 13 of Bisoku Zenshin does anything right, it's demonstrating the 'broad' in Bisoku Zenshin's broad characterization. As in the main cour, shipgirls are introduced in a swift manner by showing them in action. In Sirius's case this is done by having her find every concievable way to fail an easy task, inevitably ending up in an erotic pose in the process. You might think that this is flanderization, but this really is her entire character in a nutshell. Smart move by Yostar to have her be in the BD-exclusive; people WILL dish out for fanservice incarnate.
Sirius's masochistic tendencies aside, there's not much to say here. Seeing South Dakota and Massachusetts was nice, but they were mostly sidelined for extra Sirius screentime. I'm also not sure why the writers chose to have another party when that was already the core theme of Episode 6; can't Sirius serve tea at a formal piano recital instead? The animation for this episode was consistent and clean, while the ED was a cute way of flashing back to the events of the main cour.
Ultimately Episode 13 is just more Bisoku Zenshin, and whether you'll like it or not comes down to your type. Do you like bashful, clumsy-as-can-be maids who like self-deprecation a bit too much? This episode has you covered. Otherwise? Meh, at least Starter Squad's antics are fun.
