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The eighth son of the Asahina family. He was born in February 22th. In Japan, this day is Neko no Hi which means cat day. Number 2 in Japanese pronunciation say “Ni” and 222 sounds like cat's cry “Nyan Nyan Nyan”. This is why we call cat day. Maybe this has something to do with the reason why Rui can talk with Ema's pet. It seems that they have good relationship each other.
We don't know what he is thinking and he is an airhead. Besides me, all women like handsome and airhead. He arouses their maternal instincts. He works as a hairdresser. His hair is really weird that look like he is in the state of being weightless. I want him to set my hair!!!! No, touch my hair!!!!
After all, the brothers are mach with Ema in almost Dojinshi. In official correlation diagram, Rui is not connected with Ema. I don't know how the authors of Dojinshi are interpret it but this is the key point of the story. The situation with nothing to do with the official correlation diagram is the real pleasure of watching Dojinshi.