Tập 1: Yuuna Yuuki thức tỉnh sức mạnh anh hùng để chiến đấu với Vertex trong khu rừng ma thuật

Yuuna Yuuki and her friends, Mimori Tougou, Fuu Inubouzaki, and Itsuki Inubouzaki are all members of the Sanshuu Middle School Hero Club, which is dedicated to helping those that request it via their website. During class one day, upon each receiving a strange "forestize warning" message on their phones, the four girls find time has suddenly stopped around them before they are enveloped by a rainbow-colored light, soon finding themselves in a strange colorful forest. Fuu, who had told the others to download a special app on their phones when they first joined the Hero Club, reveals that their club has been chosen by the Shinju to fight against mysterious enemies known as Vertex, whose goal is known as destroy the Shinju, killing the world as a result. When one of these Vertex appears and starts attacking, Fuu tells Yuuna and Mimori to escape while she and Itsuki use their phones to transform into heroes to fight against the Vertex. Determined to protect Mimori, Yuuna awakens her potential as a hero and transforms herself, using her newly found strength to fight against the Vertex. (Source: Wikipedia)

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