Collaborations

Koei has performed various third-party collaborations with their products. Consumers can often participate in them by inputing registration codes with a related product. These registration codes can be inputted online through a personal computer or mobile phones to unlock various bonuses for a game. Usually, these codes can be inputted with a Mobile Joy like method. These bonuses are exclusive to Japan.

This list will also strive to include other miscellaneous third party media that don't employ inputting a code into a cell phone. It will also combine expansions packs and spin-offs with its parent title.

General Collaborations

• Any Neoromance series event which meshes the franchises together
• Dynasty Warriors: Gundam titles
• Warriors Orochi series
• Fist of the North Star: Ken's Rage titles
• One Piece: Pirate Warriors
• Love Love ♥ Tenshin-sama Angelique
• Angelique Maren no Rokukishi
• Miss Princess: Miss Puri!
• Pokémon Conquest

Nobunaga's Ambition

Nobunaga no Yabou Tendou

• Various collaboration DLC
• Nobunaga no Yabou Online crossover event
• Special scenario for the live action film, Nobou no Shiro, in the Power up Kit and PS Vita ports
• Hyakuman-nin no Nobunaga no Yabou crossover event for the PS Vita version

Nobunaga no Yabou Online

• Various netcafe campaigns
• Every Net Entertainment Festa event
• Kunitori Zunoubatoru Nobunaga no Yabou collaboration
• Hikonyan event which allowed players a chance to own their Hikonyan pet
• Sengoku Udon collaboration
• Chacha Tengai no Onna present campaign
• Sengoku Bushou Matsuri serial codes
• Nobunyaga no Yabou crossover event with SMASH!
• Real Escape Game Owaranai Gassenkara Dasshu serial codes
• Hyakuman-nin no Nobunaga no Yabou crossover event
• Ace Kamon collaboration
• Special item themed to live action film, Nobou no Shiro

Romance of the Three Kingdoms

Romance of the Three Kingdoms XI

• Zhou Yu, Zhang Liao, and Zhao Yun's portraits from this edition appear in the bonus DVD/Blu-ray episodes of Kuragehime (Maya's episodes)

Sangokushi Online

• Special collaboration with Yahoo!Japan's Sangokushi Tokushu II presentation. Players could obtain Wakaba's trademark mantle in this game.
• Serial codes with Souten no Kouro first volume DVD purchase could unlock bonus content related to anime, such as Cao Cao's punishment club, his trademark line, a wall screen, and the Cao Cao demon figurine.
• Serial codes found on ticket purchase for Red Cliff Part II could unlock a bonus wall screen and a cloak modeled after Zhuge Liang's bird Sangokushi Online

Uncharted Waters

Uncharted Waters Online

• Various netcafe campaigns
• Every Net Entertainment Festa event
• Dream Busters collaboration
• Oceans collaboration
• 2010 Nagasaki Tall Ships Festival collaboration
• FLET'S collaboration with new character armor and sails
• Nobunyaga no Yabou collaborations for 2011 and 2012
• Hyakuman-nin no Daikoku Jidai collaboration

Ishin no Arashi

Ishin no Arashi: Shippuu Ryomaden

• Special present for registering with game and ticket for the live action film Sakuradamongai no Hen

Dynasty Warriors

Any image song in the series:

• Sora no Kakera
• Can't Quit This!!! ～KNOCK'EM OUT～
• Shenglu ~CIRCUIT~
• Cross Colors
• Ever Free
• Fuun Musouden
• Musou
• Red Cliff ~Ikusa Kokoro~ Shin Sangoku Musou 5 Special Ver.
• Ambience
• Time

Dynasty Warriors 6

• Serial codes with Souten no Kouro first volume DVD purchase could unlock bonus edit character parts for the Souten no Kouro Cao Cao and Liu Bei in the Empires spin-off

Dynasty Warriors: Strikeforce

• Special scenarios and items various video game magazine publications in both titles
• Serial codes with Shigekix purchase unlocks exclusive items for characters' usage

Dynasty Warriors 7

• Serial code with early purchases at Lawson chain granted special weapons and costumes for Wang Yuanji
• Serial code with Sangokushi DVD box set grants a small bonus for buyers
• Yoshimoto Performance Group with their Yoshimoto Musou collaboration; also appeared on Tokyo Game Show stage events for its spin-offs to play the game live for fans
• Pepsi Nex campaign
• Dengeki Playstation bonus for Next
• Chimney Group collaboration
• Hyakuman-nin no Shin Sangoku Musou collaboration
• Minna to Isshou collaboration with Toro and Kuro edit character parts
• Shin Sangoku Musou SLASH collaboration

Dynasty Warriors Online

• Serial codes found on ticket purchase for Red Cliff Part II could unlocks equipment found in the movie.

Samurai Warriors

Any image song in the series:

• Be the One
• Setsugekka
• Zan

Samurai Warriors 3

• Various store bonuses for early purchases of Samurai Warriors 3
• Kome Sengoku Musou
• Sengoku Bushou Matsuri was mainly themed to this title
• Special tie-in with the live action film, Nobou no Shiro, featuring both Mitsunaris in promotional posters; Oshi Castle stage is also counted as a collaboration with the film
• Hyakuman-nin no Sengoku Musou collaborations in both Empires and Special
• Various Japanese store chains in Empires DLC
• Nobunyaga no Yabou collaboration with Special
• Chimney Group collaboration
• Real Escape Game Owaranai Gassenkara Dasshu collaboration
• Pokémon Conquest based select characters portraits on this entry
• Bs Osaka Natsu no Jin collaboration

Fist of the North Star: Ken's Rage

• Collaboration with Comic Bunch and Weekly Famitsu

Neoromance

• Any B's Log or Lala collaborations
• Any musicals or theatrical productions

Harukanaru Toki no Naka de

Harukanaru Toki no Naka de 3

• Sanrio collaboration for Hello Kitty figurines of the Hachiyou.

Kiniro no Corda

• Social game collaborations with Love Love ♥ Tenshin-sama Angelique, Angelique Maren no Rokukishi, Miss Princess: Miss Puri!, and Hyakuman-nin no Harukanaru Toki no Naka de

Kiniro no Corda 3

• Tie-in with Yamaha's Silent Violins. Used by two of the game's characters, Chiaki Tohgane and Housei Toki.
• pivix and B's Log Bunko illustration and short story contest.

Zill O'll

TRINITY: Souls of Zill O'll

• Serial code with Dream's single, Hands Up!, to obtain rare items by registering code into game. Also the group's image songs for the game's ending credits and commercials
• Nico Nico Seiga fanart contest

Pop Cutie! Street Fashion Simulation

• Collaboration with comic, Kabushiki Gaisha Love Cotton.