Hikaru Tezuka
About
He has an older brother named Satoshi Tezuka, who is a part of the government's Library Future Planning Committee. He used to admire his brother, until Satoshi decided to leave home. Even so, Hikaru couldn't actually forget everything about him, as shown with him keeping the watch his brother gave him some time ago. Later on, with help from Shibasaki, he threw away the watch (actually, Shibasaki sold it) and thus decided to stop thinking about him.
Thanks to his brother's scheme, Hikaru got closer to Shibasaki while trying to make plans. In the end, he developed feelings for her (which is mutual), and even told his brother to stay away from Shibasaki.