In the year 995, due to a secret talk between Michinaga Fujiwara (Akira Emoto) and Seimei Abe (Terunosuke Takezai), Yorimitsu Minamoto (Kanji Tsuda) is ordered to subjugate ghost Shutendoji, who lives in Oe Mountain. Yorimitsu Minamoto and his men soon encounter difficulties in carrying out their mission due to the appearance of strangers. These strangers are handsome warriors Munechika Mikazuki (Hiroki Suzuki), Kunihiro Yamanbagiri (Yoshihiko Aramaki), Hasebe Heshikiri (Masanari Wada), and Toushirou Honebami (Fuma Sadamoto) and they are trying to protect history.
Based on the manga "So Dangerous!?", which was released in 2019 and became an internet sensation, this coming-of-age film follows a group of high school students as they question the future of Japan. Asami Takahashi, a high school senior, has her own ideology about politics, influenced by her father, a former Ministry of Finance official. In her political economy class, she questions her teacher about her doubts, and ends up debunking him. Eventually, Asami, along with her classmates Abe and Nakatani, stand up to revitalize the declining shopping arcade, hoping to make the future a little brighter with their own power. On her way home, Asami visits a young local reporter, Mr. Arahata, to ask him to write a newspaper article about a festival in the shopping arcade, and on her way home she meets a talented councilor, Mr. Muto, who used to be a Sentai hero.
A sage travels to the past and collects a set of eight legendary swords, which bring to life a gang of talented but dysfunctional young warriors. The warriors know that Nobunaga Oda was supposed to die at the Honno-ji incident in 1582, but in this timeline he didn’t. To revert back to the original history, the warriors must travel back in time to assassinate Nobunaga Oda.
One day, the protagonist realizes that he lives inside a "world of BL." As he likes girls, he fights back against any hot guys that might draw near, but this is a "world of BL"... he's still assailed with the sight of people in lovey-dovey situations one after another!