Kanokon Omnibus 4 collects volumes 7-9 and features story by Natsumi Nishino and art by Rin Yakami.

After a spell shrinks Chizuru's fabulous breasts, Chizuru and company start working overtime to get her curves (and yokai powers) back. They quickly realize that Minori, a shape-shifting young girl who claims to be Kouta's little sister, is behind it all.

For some mysterious reason, Minori is determined to kill Kouta, even if it means destroying the whole world in the process! Will Kouta and Chizuru's love be strong enough to save her bust... and the world?