Sada Seiya, works as as the ace of the second sales division known informally as the “Ikemen Department” in the Intermedia Communications Department at a general trading company. Due to Sada’s natural tendency to always try and look cool, he stuck to the facade of having “a long-term girlfriend” and ended up in a situation where he was “0.5D,” or half a virgin. However, after ten years, Sada falls in love again. He decides to seek love advice from Uno Daiki, a junior both from his university and his company, who has had eight girlfriends in the past…
Hiro's so stressed out at work that he can barely have proper meals or get some well-earned sleep. When he passes out on the sidewalk after yet another stressful day, an unfamiliar face calls out to him - apparently, they once promised to marry each other? What's Kai Fukaya's deal, and why is he so insistent on assuming the role of Hiro's fiancé?
Yoshihara Akihito had no particular goal and just managed to manage his daily life. One day, he happened to meet Ishikawa Eriko, who had a secret feeling in high school. Akihito decides to make a plan when he sees Eriko, who rejects all the past, "memories that he wants to change" and "memories that he wants to erase" that are revived by the reunion. To settle the abominable past for the two in high school. A straight and slightly bitter youth group story that depicts characters with a dark past facing each other desperately while being clumsy in order to repaint the memories of memories that turned away from their eyes as adults.
Students, including Aoi Nishino, take part in class and sports activity at a prestigious high school. Aoi Nishino is a member of the school's archery club. He practices archery studiously and doesn't socialize much with the other students. His childhood friend Haruka Seno is also a member of the archery club, but she worries about Aoi Nishino. One day, thunder strikes the school grounds. After that, the ordinary lives of the students changes drastically. Many samurai descend on the school grounds. It appears that the entire school has traveled back in time to the Sengoku period. Making things worse, they realize that they are in the time right before the Battle of Okehazama takes place.