The Secret of the Frog Stone is a supplement "extra episode" to the series as was Sharp's movie last year, though this case is not plot-relevant. It's a pretty interesting take on the existence of Witch Frogs and puts into perspective the length of time passed since the former Queen's reign, as well as interpretations on historical Japan. I thought the masks were really significant, as masks frequently hide emotions and can be read as a sign of adhering to traditional behavior on a surface level, as well as dealing with various factors such as love. I enjoyed the connections to Aiko's parents and theheartwarming ending as well; this was a great addition to the story, as was the tale of lovers. I found it interesting that making masks was used traditionally and reflective of a time period where harsher circumstances were in effect. It's a shame that there was minimal detail for the lovers, but Doremi's actions to help them unite towards the ending were well-done. Unfortunately, the movie is frankly a bit vague on the actions and references traditional Japanese lore, which could be a turnoff for some viewers looking for a quick story. The movie doesn't really give the viewer enough time to get invested in (or learn about for that matter) Japanese legends and as a result, it can be intimidating. I like the idea, but hopefully something less obscure can be done, unfortunately. The ending is also incredibly morbid and depressing, popping up out of nowhere and leaving things on a sad note for no real reason. 4/10.