Kurumi's the spirit nobody expects to soften, the one who makes you believe something genuine could exist between her and Shidou despite everything you know about her. That planetarium scene doesn't just look beautiful, it rewrites what you thought you understood about her underneath all the obsession. You watch her remember she's human for a day, and it costs everything, and that's the whole show.

Shidou Itsuka runs into Kurumi Tokisaki at the Tanabata festival, and she insists on a date right away. Nervous, and afraid of what might happen if he says no, he agrees. Their day winds through a planetarium, food stalls, and a mock wedding ceremony, and Shidou watches the notoriously dangerous spirit show a gentler side he never expected. Meanwhile, his friends Tohka, Yoshino, and Kotori search the festival for him while enjoying the celebrations themselves. Kurumi behaves like an ordinary girl, which leaves Shidou wondering what she is really after, since he knows her as the "Worst Spirit." As the day draws to a close, he starts to grasp the truth behind it all. The single OVA episode mixes fantasy, romance, and slice of life, and was originally an unaired episode of the TV series.