|Japanese name:||比良平 ちさき|
SpoilersAfter 5 years for the hibernation, Chisaki lives with Tsumugu and his grandfather in an apartment. Chisaki is now a nurse in training. Chisaki had a crush on Tsumugu even when they were in middle school, and it was more so five years later, but the two made no progress as Chisaki didn't want to betray her feelings for Hikari and felt bad for staying on land while the rest of them were hibernating. She said that she didn't love Tsumugu when he confessed to her while she loved him deeply.
At the end of the series, she gets together with Tsumugu.