"In this world, an A.B.C. of love exists. 'A' is kissing, 'B' is making out, and 'C' is sex. I'm hanging onto this word even though many today would call it obsolete. And that's because... That's right... on top of us never having had sex... we've never even kissed yet!" Tattoo artist Kyoya and a popular dancer Tsubaki are a super pure couple who haven't even reached "A" (kissing) yet! This is a story of how the two of them finally manage to stumble all the way to "C" (sex).