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 Shinobu2. Secret Mission by Saeki Yashiro3. Fang by Kawazoe Mariko & Nakamura Sachiko4. Black Swastika Army by Katagiri Ikumi5. Mushroom and Kappa - A Fierce Conflict of Honourable Men by Magami Guriko6. Boys’ Cavalry by Kayase Shiki7. Rindou by Asada Yasuka8. Hideout by Sekka9. Un Orso by Mizuhara Kenta10. Be Enthusiastic, Father! by Inui Miku11. A Promise by Seno Tatsune & Takamiya Aya12. Let’s Meet at the Secret Society by Kinoshita Sakura13. Will O' the Wisp by Kouzuki Leo14. The Village of the Secret Agreement by Ueda Shinshu15. At the End of an Endless Desire by Akai Higasa16. Demon King Time by Kanou Ruri17. Messenger of Justice ★ Moonlight Organisation by Usaki Hitomi

Hayate Sakura, a normal high-school student except one thing: ghosts are attracted to him. One day, someone saved him from all the ghosts he had attracted. His so-called hero introduced himself as Undertaker Riddle who sends spirits to peace. Sakura then asked him a favor if he could help him get rid of the ghosts, and in exchange he'll do anything. Undertaker Riddle then offered Sakura to work for him as an Undertaker too. Will he take the job and get rid of the ghosts, or decline the job and have the ghosts on his tail for the rest of his life?

From Bliss: After losing their parents at an early age, Natsuhiko and Haru had to be seperated. Years later, Natsuhiko opened a cafe hoping to fulfill his and his parents' dreams. After an incident with a customer, Natsuhiko finds out that he is his younger brother. Unfortunately, he now works as a host. Not only that, Natsuhiko had racked up plenty of debt to finance his cafe. Can Natsuhiko overcome these obstacles and convince his younger brother to come back and keep his cafe, and their dreams, alive?

From Yen Press: Accepting the post of Royal Tutor at the court of the king of Grannzreich, Heine Wittgenstein is a little professor with a big job ahead! Each of the kingdom's four princes has a rather distinct personality. Does their diminutive new instructor have what it takes to lay down some learning? It's a comedy of educational proportions!