This is special ova Episode is a bonus chapter from volume 6 chapter 23.5 or 25.6 it's between Kyoto saga Episode 5 and 6 if you care about about manga order every one says it's a filler Episode which is wrong as this is part of the manga. The is really wholesome to watch sweet and sad if you love kuro then watch this of you don't like kuro then watch this and maybe you will love kuro. This is best watched after Episode 10 of Season 1 Episode 11 is filler and can be watched after either 10 or 11. Just know most ofthe Episode has filler because the bonus chapter run away kuro is so short like 5 minutes or so if they adapted it with out filler but the filler makes its much better.

Animation 8/10
Music 10/10
Dub voice acting 10/10
Entertainment value 8/10

Overall 8/10