I had totally forgotten this retcon chapter. In the first chapter Mikana noticed the demon has fallen for Cecilia, so she had no trouble leaving her behind, knowing the demon wouldn't do anything to her. Yet here the author rewrote it anew to create this relationship drama for Mikana+Yuuga. Just look at her expression in the first chapter: she's blushing and smiling knowingly. Too bad for the author, Mikana's expression back then was drawn so well that it doesn't match at all the new narrative in this chapter.