Seems like there is a manga/dojin where Chikane and Himeko are both with these ears.
popThis may be rather sudden, buteh-hemNice to meet youHelloYou think so?We both have long hair and wear a hairband.
(Chi)popWe also have a pretty similar atmosphere about us.
Mysterious, you could sayAren't we rather similar?Homu!?Well... I generally agree with you there.Aren't there also other characters like that?
(Ho)