Reason for watching: I like the parent story enough to want more
Since is a side story, I will keep this short, I have reviewed extensively on this show under its main story already. The Art and Sound are more or less the same quality as the main series, meaning the Art is impressive to my taste, and there's nothing majorly bad about the Sound either. Characters designs are the same as Season 1.
Story-wise, is pretty much a flashback. a backstory on an event that both Reiji and Theo shared. Is not a story that brings out any excitement and/or tension, nor does it seem like it will ever play a part in the main story either. The story is just to portray a little of a "slice of life" feel in the main casts' life. Like a get to know your characters outside of their work life. So don't go in expecting interesting lore or legends or actions. Is a pretty calm and relaxing story, with some laughs here and there. Since I am basically a fan of the characters, my rating might be a little on the high side, as I enjoy knowing more about them.