I really think Himeno needs something else to her character to make her relevant againg. The manga has her name in the title, the author can't just act like she is a background character.
@Romanaire No clue what you mean make her relevant, shes been the main focus of like every chapter but 3 or 4 not counting complete filler bonus "chapters" like this, ouji is the one that has a tendency to sometimes outright vanish from main chapters or only appear for like a few panels as a punchline but thats kind of the point