The Zero-Sum Original Anthology Series features themed oneshots from various mangaka that publish in Ichijinsha's Zero-Sum and Ward magazines. Volume 10 theme: Conflict and Secret Societies.

1. Ranpo-sensei Laughs Like This by Takayama Shinobu
2. Secret Mission by Saeki Yashiro
3. Fang by Kawazoe Mariko & Nakamura Sachiko
4. Black Swastika Army by Katagiri Ikumi
5. Mushroom and Kappa - A Fierce Conflict of Honourable Men by Magami Guriko
6. Boys’ Cavalry by Kayase Shiki
7. Rindou by Asada Yasuka
8. Hideout by Sekka
9. Un Orso by Mizuhara Kenta
10. Be Enthusiastic, Father! by Inui Miku
11. A Promise by Seno Tatsune & Takamiya Aya
12. Let’s Meet at the Secret Society by Kinoshita Sakura
13. Will O' the Wisp by Kouzuki Leo
14. The Village of the Secret Agreement by Ueda Shinshu
15. At the End of an Endless Desire by Akai Higasa
16. Demon King Time by Kanou Ruri
17. Messenger of Justice ★ Moonlight Organisation by Usaki Hitomi

Volume 11 : Time Travel & Time Travelers1. A Watch Seller Travels Through Time by Takayama Shinobu*2. The Classroom Where He Is by Kumeta Natsuo3. The Person from the Future is Next to You by Mikawa Verno4. Time Travel by Gunjou5. The Professor and the Strange Love and Hate by Saeki Yashiro6. Samurais by Kari Erika7. Mushroom and Kappa - Time Travel Chapter by Magami Guriko8. Memento Mori by Tokitoh Kanade9. Darkness Future Design by Yoneyama Setsuko10. You Can’t Travel Through Dimensions by Kinoshita Sakura*11. If Time... by Buchi Keiko12. Nankai Loop? by Serikawa Mame13. Future Tedium Efforts Record by Mitsu Nanae14. When I Came Home, There was a Samurai by Igarashi Ran15. After Long Long Years by Sakura Maro* indicates oneshot being scanlated.

Volume 9 : Transformation and Personification*1. The Wolf and the 7 Baby Goats by Minekura Kazuya2. A Ramen Academy That Can Make a Line! (Temporary) by Kinoshita Sakura3. Mushroom and Kappa - Personification Chapter by Magami Guriko*4. Engi Maker by D. Kissan5. The Fox Cub’s First Love Transformation Technique! by Gunjou6. The Cat’s Turn by Saeki Yashiro*7. Little Heart by Ninagawa Tomo*8. A Nameless Quality by Tokitoh Kanade9. The Chosen One and Their Power by Mikawa Verno*10. "Thank Dogs Day" by Aoto Takane11. A Sprinkling of First Love by Akanatsu*12. Super Human Console by Shindo Arashi*13. Private Solar System Academy by Sakuramaro*14. My Blue Bicycle by Zekkyou*15. Tique-tique by Mitsu Nanae*16. The Raven and Pomegranate by Yoshizawa Tomoya17. Humanoid Début by Kana Sakana* indicates oneshot being scanlated.

Volume 4 : Vampire*1. Sleeping Vampire by Kinoshita Sakura*2. Mushroom and Kappa: Arcana compilation for vampires on business trips by Magami Guriko*3. Crossing the River by Kouga Yun*4. A Shower in the sunshine by Omote Sora5. Urban Vampire by Bikke*6. Sky Burial by Takayama Shinobu7. Today's Dining Table by Saeki Yashiro*8. The Aegis of the Coffin of Time by Yugyoji Tama*9. Forest of Nobility by Kayase Shiki*10. Chiyo-sama! by Shindo Arashi11. Strigoi Kingdom by Serikawa Mame*12. The Catharsis of Truth by Inui Miku13. Blood Donation Advice by Igarashi Ran14. The Novice Vampire by Amamiya Azusa*15. A Gentle Temperature by Kisaragi Yoshinori* indicates oneshot being scanlated.

A little boy with amazing scientific knowledge lives in a lonely mansion with his butler. But their seemingly peaceful existence is quickly shattered as researchers, military personnel, and killer androids start pursuing the boy, determined to seize his experiments and harness his knowledge to their advantage.

From Tokyopop:

Kantarou, a folklore scholar living in the Taisho period, has various and sundry adventures. But Kantarou moonlights as an exorcist solving the problems of ghosts and demons, all with the help of Haruka, the legendary demon-eating tengu!

Note: The serialization was in a shoujo magazine: Comic Blade Avarus.

From ADV Manga:

Private Investigator Loki is certainly an extraordinary fellow with an incredibly demanding profession. While his boyish good looks disguise his true nature, no challenge is too tough for Loki. He digs up evidence surrounding kidnappings, murders, suicides, and the like.

Not only is it Loki's job to solve mysteries, but he must also protect his own interests, namely his family, especially when those who want him rubbed-out enter the picture.

When old adversaries strike too close to home, Loki must prepare, not only to solve the crime, but to survive the vicious attacks! If the action's hot, you can count on Loki being there!

The Norse god of mischief Loki has been banished to the human world in the body of a young boy. In order to redeem himself, he sets up a detective agency and dispels the evil residing in people's hearts. He is joined by Mayura, a spiritually clueless high school girl with a passion for mysteries, and eventually, other Norse gods begin appearing around Loki for unknown reasons.

The occult mystery story follows the Norse god Loki after he is exiled to the mortal world in the form of a human child. He must collect auras of evil in order to return to the world of gods, so he runs a detective agency to accomplish this.[ANN]