第1章 二次元or假面骑士

Second Dimension or Kamen Rider

(Kamen Rider + Oregairu, Spring Pigs, Natsume, Quintessential Quintuplets, Chunibyo, Pancreas, Kame, Anohana: The Flower We Saw That Day, Four Lies... Multiple female protagonists + no CP breakup)

Nangong Yuze, who fell to his death from a building, accidentally traveled to the world of Kamen Rider, where he befriended other Kamen Riders and, after a series of battles, was unexpectedly reborn into the world of anime. Faced with so many stories filled with regret, Nangong Yu decided to rewrite the sad ending with his own actions, leaving no regrets behind.

Nangong Yuze: "The ending of the story is decided by me!"

Hikigaya Hachiman: "I don't have a dream, but I want to protect it."

Azusagawa Sakuta: "Even if I don't have a card, I will seal you!"

Natsume Takashi: "Burn your life!"

Uesugi Fuutarou: "My blood is boiling!"

（假面骑士+春物，春猪，夏目，五等分，中二病，胰脏，可忆，未闻花名，四谎……多女主+不拆cp）
因失足坠楼而死的南宫雨泽意外穿越到假面骑士世界，在假面骑士世界与其他假面骑士成为朋友，不断战斗之后，又意外重生到二次元动漫世界。面对遗憾意难平如此之多的故事，南宫雨决定，用自己的行动来改写悲伤结局，让故事不再有遗憾。
南宫雨泽：“故事的结局由我来决定！”
比企谷八幡：“我没有梦想，但我要守护梦想。”
梓川咲太：“即便我没有一张牌我也要封印你！”
夏目贵志：“燃烧生命吧！”
上衫风太郎：“我热血沸腾了！”