This OVA takes place around the end of S1. It’s been a while since Kuroko and the team have been to a Maji Burger, so all of Seirin gets together to sit down, have a meal, and, as Riko puts it, have a talk “about a bunch of off-the-cuff, stupid, random crap!” It provides a nice little recap of season 1 and serves as a bookend to that season.
