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Kamen Rider Build ~The 7 Best Matches Raising the Hazard Level~ (仮面ライダービルド ~ハザードレベルを上げる7つのベストマッチ~,Kamen Raidā Birudo ~Hazādoreberu o Ageru Nanatsu no Besuto Matchi~) is a YouTube web series set within the continuity of Kamen Rider Build.[1]
This is the first web series where the main Rider doesn't assume his main default form although a picture of Build's RabbitTank Form was seen in the first episode.
This is also the first web series that don't have any Legend Rider form.
Soichi remains transformed as Blood Stalk for the whole series.