The OVA adaptation Tono to Issho is based on Ohba-Kai's 4-koma gag manga about the humorous exploits of generals during Japan's tumultuous sengoku period (Era of the Warring States). The DVD includes a bonus anime called "Gackt mo Issho", since the singer and actor Gackt is playing a character in the anime - as the legendary warlord Uesugi Kenshin. (based on ANN synopsis)