In the mountains, Tsukasa and Nasa find a final gift‚ and a final puzzle‚ left for them by Tokiko. Can Nasa unlock the high-tech secrets hidden in an antique clock? Or will Tsukasa manage to break things beyond repair? It's high time the couple finally had a talk with Kaguya, the girl genius who acts like she's new to this planet. Not that she'll do anything but drive Tsukasa up the wall.

Volume 21 of the Fly Me to the Moon manga series by Kenjiro Hata.