In the Otome no Omocha series:

Vol.1 - Otome no Omocha

- Ko Akuma Guardian

Mikana Natsume is an idol whom has just been given a bishie bodyguard, Ayase Touma; to which Mikana is over the moon about until she's told that they cannot become lovers!?

Vol.2 - Zoku Otome no Omocha

Vol.3 - Otome no Omocha Sweet