When mankind's savagery surpasses his fear of death, there is little hope for those who wish to live honest lives. Beneath a full moon, a young boy witnesses the murder of the bandits who had enslaved him, and is then christened with a new name by the man who rescued him. This boy is Shinta, now known as Kenshin Himura, and he is destined to become a swordsman. The softness of his heart does not befit the occupation, but his desire to protect the innocent is absolute. Rurouni Kenshin: Meiji Kenkaku Romantan - Tsuioku-hen details the origins of the man who would bear the name of Hitokiri Battousai long before he swore his oath not to kill and before he earned his reputation as an assassin. The young man's heart is divided between justice and corruption, while the fate of a nation rests on his actions.

Two OVA episodes are bundled as DVDs with each of volumes 6 and 7 of the manga. The first OVA is a prequel story written by the manga's author. Before the beginning of the main story, Rea and Chihiro have already met at a certain place: an outdoor hot-spring bath. The second OVA takes place after the series (effectively episode 14). The Furuya family finds a mysterious young girl hiding under the household temple.

Ever since he was a child, zombie-obsessed Chihiro Furuya has wanted an undead girlfriend. Soon enough, his love for all things zombie comes in handy when his cat Baabu gets run over, prompting Chihiro to try to make a resurrection potion and bring him back to life. During his endeavor, he sees a rich girl named Rea Sanka yelling into an old well every day about her oppressive life. After meeting and bonding with her, Chihiro is convinced by Rea to persevere in saving Baabu. Eventually, he succeeds with the help of the poisonous hydrangea flowers from Rea's family garden. Unaware of the potion's success and seeking to escape the burdens of her life, Rea drinks the resurrection potion, mistakenly thinking she will die. Though it doesn't kill her, the effects still linger and her death from a fatal accident causes her to be reborn as a zombie. With help from Chihiro, Rea strives to adjust to her new—albeit undead—life. For a boy wanting a zombie girlfriend, this situation would seem like a dream come true. But in Sankarea, Chihiro's life becomes stranger than usual as he deals with Rea's odd new cravings and the unforeseen consequences of her transformation.

A special summary episode of the first season of Sayonara Zetsubou Sensei, focusing on seven of the girls: Komori Kiri, Matoi Tsunetsuki, Kobushi Abiru, Kimura Kaere, Kitsu Chiri, Sekiuchi Maria Tarou and Hitou Nami. Note: This entry also includes the 24 minute version which aired on BS11.