Luka Urushibara

Ruka Urushibara (漆原るか, Urushibara Ruka) is a bishōnen who looks strikingly like a girl and even wears the garment of a miko despite being a boy. He is a close friend of Mayuri and is often asked by her to try on her cosplay costumes. He had strong feeling for Okabe because he protected him from the stalker and did not care that whether he is a boy or a girl; However, this feeling was hidden because he was a boy. He is turn into girl as he Okabe to send a D mail to her mother.