Higashi flunks an important math test and might end up having to repeat the year if she doesn’t ace the make-up exam! Desperate, she begs the top student in her class - the mousy, tomboyish Eto - for a private cram session. The tutoring does the trick, but when Higashi gets an up-close look at her study-buddy’s features, she’s smitten…so she decides to repay Eto’s good deed with a private lesson of her own.