The Zero-Sum Original Anthology Series features themed oneshots from various mangaka that publish in Ichijinsha's Zero-Sum and Ward magazines. Volume 13 theme: Love and Reverse Harems.

1. The Wicked Are Worriers by Futaba Hazuki
2. Sesame Seeds and Soy Beans by D Kissan
3. Forced Love by Mikawa Beruno
4. Room 204, Higan Manor by Hasumi Natsumi
5. From the Distant East by Someya Kaiko
6. Beside the Reverse Harem by Mizuhara Kenta
7. Fiancé and Thief by Kosugi Mayu
8. Irresistible Girl by Igarashi Ran
9. Princes by Kari Erika
10. Cherry Blossom Love Affair by Fujiwara Yuu
11. Wild Kingdom by Saeki Yashirou
12. Lesson by Kyou
13. Devil's Bride by Mr. Megane
14. Won't You Be My Everything ? by Shindou Arashi
15. Possessed by Serikawa Mame
16. L'Égoïsme de la princesse by Akizuki Ichiha