Gaim Gaiden: Kamen Rider Guridon VS Kamen Rider Bravo

Gaim Gaiden Kamen Rider Guridon VS Kamen Rider Bravo; 鎧武外伝仮面ライダーグリドンVS仮面ライダーブラーボ
Director	Morota Satoshi
Writer	Mouri Nobuhiro
Studio	Toei
Release date(s)	October 25, 2020
Forum Thread	Thread

Kamen Rider Gaim
< Duke/Knuckle	Gaim Gaiden Kamen Rider Guridon VS Kamen Rider Bravo 鎧武外伝仮面ライダーグリドンVS仮面ライダーブラーボ

A two-part web series for Kamen Rider Gaim, created years after the series ended.

Lock Seeds

Jounouchi Hideyasu - Matsuda Ryo → 城乃内秀保 - 松田凌
Oren Pierre Alfonzo / Kamen Rider Bravo - Yoshida Metal → 凰蓮・ピエール・アルフォンゾ / 仮面ライダーブラーボ - 吉田メタル
Kureshima Takatora / Kamen Rider Zangetsu - Kubota Yuki → 呉島貴虎 / 仮面ライダー斬月 - 久保田悠来
Suzuka Masako - Sumi Tomomi Jiena → 鈴鹿まさこ - 鷲見友美ジェナ
Producer - Wakasa Katsuya → プロデューサー - 若狭勝也
Reporter - 　Tomioka Eriko → リポーター - 　富岡英里子
Extras - 　CASTY → エキストラ協力 - 　CASTY

Release was associated with the Gaim CSM toy releases. To promote this series, the two stars of this appeared briefly as guests on the current week's Saber.
Sumi Tomomi Jiena represents Gaim in Kamen Rider Girls. She's also been on Gaim two times before as a member of Team Pop Up, not sure if these characters are supposed to be the same in-world.
Episode 2 uses footage from episodes 25 and 32.