Diamond Daydreams (Diamond Dust Drops) (Kita E): Nurse Yuki.

Yuki is a young nurse working at the hospital where Karin is staying.  She was secretly sending encouraging messages to her  patient under the name 'Your Fan' leading to a misunderstanding.  She had been dating Dr. Amakasu since high school.

Bonus: Unnamed characters 

Servant x Service: Saya Miyoshi

 Saya is a civil servant who likes her job because of its stability.  Although she tends to be a quite soft spoken she can be unintentionally sharped tongue.  She can often be seen  dealing with the elderly Ms. Tanaka.