ippatu's manga debut, Tsugumi Project, was first published in France before being picked up for publication in Japanese and English by Kodansha.

In this acclaimed, postapocalyptic action manga, a soldier named Leon is taken from his family on a trumped-up charge and dropped into a suicide mission to recover a dangerous weapon from a deadly place, a place ruled by huge, irradiated, mutated monsters--a place once known, 200 years ago, as Japan. One of the scant pieces of information they have is the weapon's Tsugumi.