Unaired 12th episode that is included in the fourth home video release.

The members of the Hero Club are back in action after their close call with disbandment, and they’ve been tasked with their toughest mission yet! The student council wants them to travel to a distant temple (well, lodge) and assist the guardian (well, caretaker) in his duties. As the club members set off of their quest, Mizuki begins to realize just how accustomed she’s become to her very exciting high school life…

(Source: Sentai Filmworks)