This is the spin-off of +C: Sword and Cornett

Crown of Nibelung focuses mainly on Leo, the second royal prince of Nohr. It is an adaptation of the game and follows the Revelation route. The Avatar is depicted in her female incarnation. It makes some references to other material related to Fire Emblem Fates, such as the drama CD. For example, it mentions the Clarkenstein villa within the imperial palace, where the Nohrian Royal Family officially resides.

In 19th Century England, during the Victorian Era, there is the Kingdom of Tarnina Ulaniborg. The Kingdom has a Royal Academy where Royalty and Commoners can study Astronomical Research in hopes of becoming a Royal Astronomer. Astel Paschalis attends the Royal Academy as a scholarship student with a certain hidden motive.

The anthology features works by mangaka from "Ward" and "Comic Zero-Sum". A new volume is released every four months. VOLUME 1: SHITSUJI (BUTLER) 1. Spider's Nest ~ Minekura Kazuya 2. Nice to Meet You, Young Lady ~ Kouga Yun 3. Holly Green and White Little Garden ~ Takayama Shinobu 4. The Situation of Goshogawa Yuzuru's Magnificant Mansion Creation ~ Miyamoto Fukusuke 5. Butler of Worry ~ Higashiyama Kazuko 6. Elevenses ~ Mikanagi Touya 7. The Incident of the Butler's Birthday Project ~ Saeki Yashirou 8. Le Droit D' Aimer ~ Haibara Yaku 9. Young Lady's Butler ~ Yoneyama Setsuko 10. The Melancholy of the Irritable Boy and Butler ~ Kikuta Yui 11. The Moon and the Visitor ~ Nanjou Tsugumi VOLUME 2: REBEL AND PHANTOM THIEF 1. CANDY ~ Haibara Yaku 2. "...That Story." ~ Masaki Haruka 3. FLIES ~ Minekura Kazuya 4. Arabiana ~ Mizuhara Kenta 5. The Ancient History of the Three Thieves ~ Takayama Shinobu 6. The Adventure of Captain Arco Iris ~ Tsutsumi Shouko 7. SKYHIGH TENSION ~ Fujimura Ayumi 8. Mushroom and Kappa: Arcana compilation for thieves on business trips ~ Magami Guriko 9. The Lonely Mountain Robber ~ Tachibana Ayun 10. LANEKEEPER ~ Fujiwara Yuu 11. Moonlight Honey ~ Shindou Arashi 12. The Unlucky Pirate ~ Asada Yasuka 13. Strobo Rider ~ Kouzuki Reo 14. Moonlight Dance ~ Kouga Yun VOLUME 3: PRINCE AND PRINCESS 1. Prince of Stars ~ Minekura Kazuya 2. Mushroom and Kappa: Arcana compilation for princes on business trips ~ Magami Guriko 3. Flower King ~ Kouga Yun 4. Rose Princess Destiny ~ Kinoshita Sakura 5. The Window of Rain ~ Takayama Shinobu 6. My Knight is a Princess ~ Kosugi Mayu 7. The Beggar Princess ~ Ueda Shinshuu 8. The Dawn Outside Heaven ~ D. Kissan 9. Princess Academy ~ Mikawa Verno 10. PRINCESESS ~ Kari Erika 11. Our Majesty's Tactful Words ~ Kisaragi Yoshinori 12. Heart-Racing Engagement Meeting ~ Saeki Yashirou 13. Listen to the Song I Sing ~ Mizutani Yuzu VOLUME 4: VAMPIRE 1. The Vampire of the Sleeping Forest ~ Kinoshita Sakura 2. Mushroom and Kappa: Arcana compilation for vampires on business trips. ~ Magami Guriko 3. To Cross the River ~ Kouga Yun 4. A Shower in the Sunshine ~ Omote Sora 5. URBAN VAMPIRE ~ Bikke 6. Sky Burial ~ Takayama Shinobu 7. Today's Dining Table ~ Saeki Yashiro 8. The Aegis of Time's Coffin ~ Yugyoji Tama 9. Forest of Nobility ~ Kayase Shiki 10. CHIYOSAMA! ~ Shindo Arashi 11. Strigoi Kingdom ~ Serikawa Mame 12. The truth of Catharsis ~ Inui Miku 13. Blood Donation Advice ~ Igarashi Ran 14. The Novice Vampire ~ Amamiya Azusa 15. Gentle Temperature ~ Kisaragi Yoshinori VOLUME 5: JAPANESE STYLE / SAMURAI 1. Last Night's Rain Lifts ~ Minekura Kazuya 12. The Queen’s Dog ~ Araishi + Oshino 13. Kakure Oni ~ Mikanagi Touya 15. Miokuribana ~ Kikuta Yui VOLUME 6: SPECIAL FORCES / TEAMS 2. Monach Sacred ~ SENO Tatsune & TAKAMIYA Aya 7. Frightening Eccentric ~ Sakamaki Yukisato 15. Twins Pocky ~ Serikawa Mame 16. Pledge of the Ox ~ Kayase Shiki VOLUME 7: WIZARDS AND MAGICIANS 2. Night bird ~ Kouzuki Reo 3. Mushroom and Kappa - Magic Users’ Chapter ~ Magami Guriko 4. good day for me ~ Omote Sora 5. Love Coloured Glasses ~ Bikke 6. The Kind Black Witch ~ Ueda Shinshuu 7. The Magician and I ~ Mikawa Verno 8. Kokonoe Kyuujutsu ~ Aoto Takane 9. Forest’s Poison ~ Kumeta Natsuo 10. The Witch and I ~ Saeki Yashiro 11. Kashoku ~ Kayase Shiki 12. Magical Girl Alice and Her Brother ~ Igarashi Ran 13. Magic! ~ Mizuhara Kenta 14.The Kind Magician and the Paper Bag Girl ~ Mizutani & Kaede 15. Secret Service ~ Suzuki Ichiko VOLUME 8: SHITSUJI 2 (BUTLER) 5. Le Droit D'Aimer ~ Haibara Yaku [SS] VOLUME 9: TRANSFORMATION / PERSONIFICATION 1. The Wolf and the 7 Baby Goats ~ Minekura Kazuya 7. Little Heart ~ Ninagawa Tomo 8. A Nameless Quality ~ Tokito Kanade 12. Super Human Console ~ Shindo Arashi 13.Private Solar System Academy ~ Sakura Maro 14. My Blue Bicycle ~ Zekkyo 15. Tique-tique ~ Mitsu Nanae 16. The Crow and the Pomegranate ~ Yoshizawa Tomoya VOLUME 10: CONFLICTS / SECRET SOCIETIES 11. A Promise ~ Seno Tatsune & Takamiya Aya VOLUME 11: TIME TRAVEL & TIME TRAVELERS 1. A Watch Seller Travels Through Time ~ Takayama Shinobu 2. The Classroom Where He Is ~ Kumeta Natsuo 11. If Time... ~ Buchi Keiko VOLUME 12: DEVILS & DEMONS (Sequel) 1. Demon’s Kiss ~ Inui Miku 6. Wednesday Swing ~ Sekka Arcana 13: Several Men and Love (Sequel) Arcana 14: Ninjas (Sequel) Arcana 15: School Uniform (Sequel)

There was once a hero who vanquished the darkness of the land and liberated the people. He then built a kingdom, and had his descendants rule as kings. Although they had ruled the land for so many years, in reality, political power was being wielded solely by the aristocrats of each region. One day, this seemingly peaceful kingdom was disturbed by the mysterious death of the principal heir to the throne. The sequence of events that this assassination set into motion, would soon come to involve all of those with the right to become the next king...There's the spin- off: +C: Sword and Cornett Appendix

Leto is employed as an apprentice by the skilled mercenary Alpha, from the mercenary unit Boreas. He struggles to rid himself of his apprentice status and be accepted by Alpha. However, as a mercenary, many painful encounters and terrible experiences await him…