By suggestion of her friends, Escha attempts to make a copy of her artificial tail but despite being a profitable opportunity, she is more interested in doing so to learn more about her late mother, who created it for her.

The members of the R&D division prepare for the arrival of an auditor to check on their work, when one of their members, the swordswoman Linca is spotted causing trouble around town and is put under suspicion, despite claiming innocence, until Escha and Logy learn from Marion the truth about her.

While looking for key components to complete an airship, Escha learns about Logy's dreams, but that a tragic accident made him abandon them.