[The AP Ninja]

On episode 4, we see two poof-like ARs from main characters...and, sadly, one seems permanent.

On the cliffhanger of episode 3, the protagonist uses a special attack, and in episode 4 the effects of using it have already taken place. This is the AR with the most RN potential, even if it is poof-like.

On 10:10, the episode's villain (who turns into a secondary character) suffers the aforementioned permanent poof. Since she appears in the opening in loli form, it's safe to asume that this AR is permanent.

Now, the episode features a large-chested "yokai" as well...so we may see several ARs throughout the anime and maybe RNs...so all we can do now is wait.