Keisuke Jin tries to save his father Dr. Jin from an attack by G.O.D. and is shot and killed in the process. However, in exchange for his own life, Dr. Jin resurrects Keisuke as the cyborg Kaizorg! Learning of his mission from Dr. Jin's last words, Keisuke becomes Kamen Rider X and battles G.O.D.!

This is a completely new story with no relation to previous Gundam series. Set in the 21st century with Japan as the main stage where a mysterious army has invaded with super weapons called Mobile Suits, the protagonist stand against them with a mobile suit called "Gundam". The year is 200X. A mysterious robot fell from the sky into Tokyo. The robot is called a "Mobile Suit". Meanwhile, another Mobile Suit named "Gundam" crash landed near Kurono.

1. **Toarui Ichi EROICA Fan no Tsubuyaki...** (とあるいちEROICAファンのつぶやき…) \[Ryouko Shitou\] 2. **Buchou Tetsuno Klaus** (部長鉄野クラウス) \[Miwa Sakai\] 3. **Denwa no Mondai** (電話の問題) \[Maya Mineo\] 4. **Lawrence yori Ai wo Komete 20XX** (ロレンスより愛をこめて20XX) \[Kanako Nanamaki\] 5. **Bluff pro yori Ai wo Komete** (ブラフプロより愛をこめて) \[Michiyo Akaishi\] 6. **Uruwashi no Eroica yori Ai wo Komete** (薔薇の伯爵に愛をこめて) \[Seika Nakayama\] 7. **Son Goku yori Ai wo Komete** (孫悟空より愛をこめて) \[Tomo Aoki\] 1 8. **Son Goku yori Ai wo Komete** (孫悟空より愛をこめて) \[Tomo Aoki\] 2 9. **Son Goku yori Ai wo Komete** (孫悟空より愛をこめて) \[Tomo Aoki\] 3 10. **Seitokai yori Ai wo Komete** (生徒会より愛をこめて) \[Yukiko Toono\] 11. **Kita Mita Katta! 20XX Cyber Edition** (来た見た勝った‼︎ 20XX Cyber Edition) \[Yayoi Ogawa\] 12. **Oshiire no Takaramono** (押し入れの宝物) \[Atsuko Shima\] 13. **Shiritsu Eroica Hoikuen** (私立エロイカ保育園) \[Lemon Haruna\] 14. **Gogh Satsujin Jiken** (ゴッホ殺人事件) \[Moto Hagio\] 15 **Eroica yori Ai wo Komete Gokujou Ai wo Komete ♡♡♡♡** (エロイカより愛をこめて極上愛をこめて♡♡♡♡) \[Miyuki Takahashi\] 16. **Nantsuttemo Yappari Eroica** (なんつってもやっぱりエロイカ) \[Waki Yamato\] 17. **Haruka Narukana Arcadia** (遥かなるかなアルカディア) \[Honda\] 18. **Fake yori Ai wo Komete** (フェイクより愛をこめて) \[Kyouko Shitou\] 19. **Monogatari ga Hajimaranai** (物語が始まらない) \[Shouko Hamada\] 20 **Shousa yori Ai wo Komete** (少佐より愛をこめて) \[Naoki Urasawa\] 21. **Hanafuru Yakata yori Ai wo Komete** (花降る館より愛をこめて) \[Chika Shiomi\] 22. **Eberbach to Watashi** (エーベルバッハと私) \[Takeshi Nogami\] 23. **1980's no Shougakusei yori Ai wo Komete** (1980'sの小学生より愛をこめて) \[Moyoco Anno\] 24. **Bankara-san ga Tooru** (バンカラさんが通る) \[Haru Yamamura\] 25. **Saint Klaus no Okurimono** (聖クラウスの贈りもの) \[Noriko Nagano\] 26. **Nihon yori Ai wo Komete** (日本より愛をこめて) \[Toshie Kihara\] 27. **Ikinari Nihon Mukashibanashi** (いきなり日本昔ばなし) \[Yasuko Aoike\]