You're The Only One For Me

Gakupo is always such an over-protective brother, so it's only natural that he worries about his sister when she comes home way past curfew one night. He feels like she's acting strange, and is trying to keep secrets from him. Perhaps over a boyfriend that he's never met? That's what he thinks, but Gumi doesn't even have a boyfriend. No, Gakupo is the only one she has eyes for.