Behold the the struggle of the adorable little cockroach Gokicha-chan as she struggles to make friends with humans after moving to frigid Hokkaido to escape the unfortunate reputation her species enjoys in the Kanto region.

They say that a spirit sometimes appears on a certain crossing in town. One day, a high school boy named Sahara gets into an accident on that very crossing, causing his and his friends' lives to change forever.

Toaru Majutsu no Index SP contains several short story arcs not covered from Index and Railgun's main stories, and adds more insights into the Toaru universe. The 4 stories focus on Stiyl Magnus, Mark Space, Kamijou Touma, and Uiharu Kazari respectively.

Bakery owner Watari is perfect flirt, spoiling his old friend Kyougo. Ever whimsical, Kyougo leaves Watari again and again, hurting him, but he always comes back. There's an ache in his chest. Other loves also gather in this bakery, waiting for delicious goodies hot from its oven.

Intellectual Villages are old fashioned rural villages recreated with cutting edge technology. Those villages attract the Japanese monsters known as Youkai. The high school boy Jinnai Shinobu lives in one of those villages and has a Zashiki Warashi living in his house. He tends to run across Youkai with unnerving frequency and this often leads to trouble for him. (Source: Baka-Tsuki)

The Ribika are a race of cats possessing ears and tails. Their bodies are lithe and nimble, and they live in the land of Shisa. However, a curse called the "Void" is spreading through the forests... One of the Ribika, Konoe, lives in a small village called Karou. One morning, he wakes up to find that his ears and tail have turned black. There is also a symbol on his body; the mark of the curse. Konoe embarks on a journey through the forest to find the truth.

Based on Nitro+CHiRAL's post-apocalyptic Japan BL game, Togainu no Chi.

Toaru Kagaku no Railgun: Arts and Sciences City SS is a short story in Arts and Sciences City that takes place in the time period between September 3rd to 10th. Academy City has a exchange program with the rest of the world that allows some students to travel for this week to other places, and some students are allowed into Academy City during this time. Mikoto, Kuroko, Saten and Uiharu went to the Arts and Sciences City, made on a artificial island off the coast of California for a field trip. The Arts and Sciences City is known as a city that has cutting edge technology (in terms of the standards of the 'Outside' of Academy City - ie it is still far behind that of Academy City's), and is trying to take over Hollywood as the entertainment capital of the world. Stuntsmen and shows occur frequently at this city, and anything out of the ordinary is treated as another show. Due to the climate apart from sleeping everyone wears their swimsuits all the time. (Source: Toaru Majutsu no Index Wiki)

The 4-koma manga follows the adventures of the characters of the world of Toaru Majutsu no Index as they stumble into various situations. *Note: Includes 3 extra chapters.*

In the world of Norse mythology, a human boy falls in love with Waltraute, the fourth Valkyrie sister. He wishes to marry her, but Waltraute gives him an impossible challenge to deter him. Nevertheless, the boy is determined to carry out the dangerous task and to marry Waltraute afterwards. (Source: Baka-Tsuki)

Just before the completion of the Academy City space elevator "Endymion", the main characters Kamijou Touma and Index encounter a level 0 girl named Arisa. The Magicians are after Arisa, and they attack Academy City. A female leader named Shattoaura leads a unit from Academy City against the attack. Kamijou and Index learn from Stiyl that Arisa is key to a brewing war between the sides of Magic and Science. When science and magic cross paths, the story begins with Endymion as its stage!

Hotaru Morino is a second year high school student who has had an unrequited crush on Ren Otaka since junior high school. One day, while on a school trip with Ren and her good friend Shiori Yamamoto, their bus gets into an accident. When Hotaru wakes up, a young man who is dressed fully in black appears in front of her. He is Kuro, a grim reaper. A shocked Hotaru shoves him away but he has shocking words for her: "I'm your guide. Hotaru Morino, listen carefully. You're dead." Hotaru learns that if she does not get over her attachment to three things within 49 days, she will end up becoming a ghost bound to a specific physical location and wouldn't be able to rest in peace. She had slept for one month after the accident and has only 19 days left. And so, Hotaru sets out to settle the three lingering regrets with the limited time she has, in the company of Kuro. One of them is to confess her feelings to Ren, her crush of five years. However, when he is in front of her, she finds it impossible to tell him how she feels. As Hotaru settles her first lingering regret, dark clouds begin to gather over her and Kuro...