The Opening Bell Rings

The Opening Bell Rings (開幕のベルが鳴る Kaimaku no Beruganaru) is the 29th episode of the series Kamen Rider Build. It features the Hard Guardians and an introduction for Vernage, as the last brief of her was in The Idol Awakens.

The air date of this episode was on April 1st, 2018. This episode was written by Shogo Muto and directed by Kazuya Kamihoriuchi.

TankTank Form

"Tank and Tank! Build Up! Are you Ready? Overflow! Koutetsu no Blue Warrior! TankTank! Yabei! Tsuei!" - the transformation announcement for Build's TankTank form.

 

The TankTank form (タンクタンクフォーム Tanku Tanku Fōmu) is one of the forms featured in the series Kamen Rider Build. It is one of the upgrade forms used by the genius physicist Sento Kiryuu. It is based on the inorganic Tank Halfbody.

It is transformed by using the Full Full RabbitTank Bottle in the tank mode, the Hazard Trigger and the Build Driver. The form first appeared in The Genius Arrives With A Tank, after Sawa Takigawa confirmed that Grease was done saving the Nabeshima family. He switched into TankTank and won the proxy battle against Kamen Rider Rogue.

This form is the second to be armed with the Fullbottle Buster, as the first is RabbitRabbit. He is portrayed by Seiji Takaiwa in this suit.

RabbitRabbit Form

"Rabbit and Rabbit! Build Up! Are you Ready? Overflow! Kurenai no Speedy Jumper! RabbitRabbit! Yabei! Hayeei!" - the transformation announcement for Build's RabbitRabbit form.

The RabbitRabbit form (ラビットラビットフォーム Rabitto Rabitto Fōmu) is one of the ultimate forms in Kamen Rider Build. It is used by Sento Kiryuu, which is an upgrade of his Hazard form, which is based on the Rabbit Halfbody.

It uses the Build Driver and the Hazard Trigger to transform. It uses the Full Full RabbitTank Bottle, set in its Rabbit mode and primarily using the RabbitTank Hazard form as the host, and covering it up with the mechanical bunny summoned every time the form is used. He first appeared in The Counterattack Hero, to defeat Rogue in the proxy battle.

In this form, he is armed with the Fullbottle Buster, which is capable of holding a total of four Fullbottles. The suit actor of this form is portrayed by Seiji Takaiwa. 

RabbitTank Hazard Form

" Hazard On! Rabbit! Tank! Super Best Match! Don Ten Kan! Don Ten Kan! Gata Gata Gotton! Zuttan Zutan! Gata Gata Gotton! Zuttan Zutan! Are you ready? Uncontrol Switch! Black Hazard! Yabei!" - The announcement for RabbitTank Hazard.

RabbitTank Hazard Form (ラビットタンクハザードフォーム Rabitto Tanku Hazādo Fōmu) is one of the forms in Kamen Rider Build. It is used by Sento Kiryuu. It is unlocked by notching the Rabbit and Tank Fullbottles with the Hazard Trigger's power. It is also Sento's turbocharged super form. 

The form first appeared when Sento had gained the Hazard Trigger from Soichi Isurugi. He wanted to test it out, while Ryuuga Banjou was fighting three Hazard Smash. When Sento transformed into this form, he is instantly lost his grip of control and went berserk in The Unstoppable Hazard. The suit is portrayed by Seiji Takaiwa with the voice of Atsuhiro Inukai.

FangJoker

"Fang! Joker! FangJoker!" - The transformation sound for FangJoker.

FangJoker (ファングジョーカー Fangu Jōkā) is one of the forms in the series Kamen Rider W. It is transformed to by the Fang Memory and the Joker Memory, used by Shoutarou Hidari and Philip, and the Double Driver. Unlike other Double forms, FangJoker uses Phillip's body for transformation.

He first appeared in The F Afterglow/Reclaim Your Partner, after Philip successfully uses it, but going berserk afterwards. After he got tired, they switched to their CycloneJoker form once more. The suit is portrayed by Seiji Takaiwa, with the voices of Masaki Suda and Renn Kiriyama.

Akaba

"Boss... thank you... for everything," - Akaba's last words, before handing Kazumi Sawatari his dog tag.

Akaba  (赤羽 Akaba) is one of the minor antagonists in Kamen Rider Build. He was born as Masaru Ooyama (大山勝 Ōyama Masaru, but after being experimented on and joining Kazumi Sawatari, he was given the name Akaba, thinking that Kazumi would actually refer him as so. Later in the series, Akaba becomes part of Sento's team, after Kazumi lost the proxy battle. He uses the Castle Fullbottle to transform into Castle Hard Smash. Later on in the series, he gets upgraded into Castle Hazard Smash. He is portrayed by Eishin.

Den-O Sword Form

"Sword Form!" - The announcement on transforming into Den-O's sword form.

Den-O Sword Form (電王 ソードフォーム Kamen Raidā Den-O Sōdo Fōmu) is one of the main form in Kamen Rider Den-O. Sword Form first appeared in Here I Come, first appeared after Momotaros entered Ryoutarou Nogami. He pressed the red button and transformed into Sword Form, and easily defeated Bat Imagin. The suit of Sword Form is played by Seiji Takaiwa, with the voice of Toshihiko Seki.