Sousuke Kaise is a Japanese manga artist best known as the creator of the series Grenadier. His professional career began in the late 1990s with the publication of several one-shot manga in Kadokawa Shoten magazines, including titles such as Sora Sekai, Insect Mission, Tasogare Asobi, and White, all published in Shonen Ace in 1999 and 2000.

The concept for his most famous work, Grenadier, first appeared as two separate one-shot stories in Shonen Ace and Ace Next between November 2000 and February 2001. The positive response to these initial stories led to the series being greenlit for regular serialization. Grenadier was officially serialized in Kadokawa Shoten’s monthly shonen manga magazine Monthly Shonen Ace from April 2002 to March 2005. The complete series was compiled into seven tankobon volumes, with the final volume released in May 2005. The manga was later licensed for an English-language release in North America, first by Tokyopop for print and subsequently by Viz Media for digital distribution.

The success of the manga led to an anime television adaptation. At the end of 2004, a twelve-episode anime series was produced by the studios Studio Live and Group TAC and broadcast on the Japanese satellite station WOWOW. The anime was later licensed for distribution in North America by Media Blasters.

Following the conclusion of Grenadier, Kaise continued to create manga. In 2008, he authored Hard Boiled: Mirage of the Griffon, which was published in Kadokawa Shoten’s Comic Charge magazine. The following year, in 2009, he created Bakunetsu Sentouki, a series published in the magazine Comic Valkyrie. While Grenadier remains his most widely recognized and commercially significant work, these subsequent titles demonstrate his continued activity as a creator within the industry.