Yuki is Tsukushi's closest friend who goes to a different, more down-to-earth high school. She's also Tsukushi's co-worker at the dango shop. She was the one who gave Tsukushi the orange toy that can sense feelings.

Whenever problems at Eitoku get too overwhelming for Tsukushi, she's there to lend a listening ear and a helping hand. But she's not quite as cynical as her good friend when it comes to the rich, as she tends to swoon when she sees the F4. Apparently she's supposed to be cute, according to the flirtatious Soujiro.