The original gag comedy manga follows the humorous yet "realistic" everyday life of Tadakuni, Hidenori, Yoshitake, and other students at a boys' high school. This entry refers to the unaired episodes released on the DVDs and BDs. The pre-air specials were all included in the TV series and are not listed separately on MAL. Episode 1: High School Boys and Ideals Episode 2: High School Boys and Loneliness Episode 3: High School Boys and Zippers Episode 4: High School Boys and Tricks Episode 5: High School Boys and Hiccups Episode 6: High School Boys and Consideration

Rinka Urushiba works part time as a waitress to help out her unemployed father. By all accounts, her life in Tokyo is a relatively normal one—but her sense of normalcy begins to fade when she inexplicably sees a flying penguin one day. Chasing it all the way to the top of a building, she encounters more surprises, including flying goldfish and another person—a classmate named Kyoutarou Azuma—who can also see these strange things. After Rinka passes out when a goldfish phases through her, she wakes up an esper with the ability to phase her body through solid matter. However, her newfound ability is not the only strange thing about her: when she uses her powers, her hair turns white. Deciding reluctantly to use this new gift to help the city, she becomes Tokyo's new hero, dubbed the "White Girl." Along with Kyoutarou, who gained the power of teleportation, Rinka begins righting the wrongs in the city while fighting other espers who have much less noble intentions.

These are a series of 13 omake episodes of Gun x Sword, tied in very loosely to the plot, with the characters as chibi puppets. The main characters are Wendy and her turtle, Kameo, who is the size of a human in this series and is able to talk. All the episodes seem to center around analyzing various events in Gun x Sword and mocking the themes displayed. They are included on the DVDs.

Kouichi Sanada and Kazuki Aihara's childhood friend Mao Mizusawa has returned after living in France for a couple of years. Kouichi is surprised to learn that, since her parents are remaining overseas for the time being, his mother has agreed to let Mao stay with them. The three friends help each other deal with the ups and downs of high school romance.