Not in Textbooks 4

Four years have passed since that emotional marriage proposal at Tsukushi Makino's high-school prom, and Tsukasa Dōmyōji announced his engagement to Tsukushi to the entire world. At an engagement dinner between their families, Dōmyōji's mother, who has been strongly against their relationship before, presents Tsukushi a tiara, which is estimated to be worth roughly 10 billion yen, as a token of their engagement. But that night, the tiara is stolen by somebody! Then, Dōmyōji and Tsukushi travel around the globe to Las Vegas, Hong Kong, and even a deserted island to get the tiara back—the legendary tiara that has been believed to "bring eternal love." In the meantime, where and what are the "F4" fellows, who have just gone separate ways, doing now?

Set one year after the drama series "Moteki." 31-year-old Yukiyo Fujimoto doesn't have money, dreams or a girlfriend. He has left his job at a staffing firm and is attempting to start a new life by working as a writer for a news site. Suddenly, Yukiyo experiences "moteki" - a period when a man becomes suddenly popular with woman. Cute magazine editor Miyuki, pure and naive office worker Rumiko, beautiful shop assistant Ai and beautiful, but tough co-worker named Motoko all become interested in Yukiyo. He tries to calm down, but is shaken by the interests of these women.

Two romantic burnouts, Jane and Will, are immediately drawn to each other at a mutual friend’s wedding. After a disastrous hookup in the coatroom, the two spend the next 24 hours together, trading candid confessions of messy histories and heartbreak, on the off chance that this fling might be the real thing.

Aoi Nishimori's parents moved to another city for work, but Aoi didn't want to transfer to a new high school. She stays behind and lives in an apartment by herself. Shūsei Kugayama moves in next to Aoi's apartment. Shūsei is a very popular student at their high school. Due to a mistake, Aoi makes the sprinkler go off in his room. Until Shūsei's room is fixed, he stays with Aoi.

Problem student Haru Yoshida sits next to the cold and studious Shizuku Mizutani in class. Without any other friends to turn to, both of them start to get to know each other and grow closer. Haru eventually develop feelings for Shizuku and confesses his feelings to her. Will Haru and Shizuku get their happily ever after?

When it rains it pours. Kenji divorced his wife, lost his job and his old squeeze Naoko is getting married back home in the north of Japan, specifically in Akita. He returns there in order to attend her wedding. Naoko surprises him by proposing that they have sex again. The one night stand is the new beginning.