"The world average age for the first sexual experience... 17.3". Is that early? Late? Seno Sakura has a serious personality. Hara Tsumugi has never liked a member of the opposite sex before. Minagawa Yuna is experienced and is currently dating a company employee. At the age of 17, the girl's "sexual values" begin to fluctuate.

Shigeru Jō joins the evil organization Black Satan after the death of his close friend Gorō Numata, who he considered his mentor. He, promised power, and fueled by a desire for revenge, undergoes surgery to become one of Black Satan's super warriors. However, Shigeru knows that Black Satan were in fact the murderers of his friend; he was using Black Satan in order to gain new powers. The newly powered up Shigeru escapes from the Black Satan headquarters before they can brainwash him into following their campaign of evil and becomes Kamen Rider Stronger. While escaping from Black Satan, Stronger meets Yuriko Misaki another cyborg warrior created by Black Satan who has the ability to transform into Electro-Wave Human Tackle. Together they fight the evil Black Satan and later the Delza Army to restore peace in Japan.

Shi Yeon is a Nine-Tailed Fox living undercover in the human world. By day, Shi Yeon is an employee at a natural history museum. By night, she's a top-ranking woman warrior in the Nine-Tailed Fox clan, charged with preserving the delicate balance between man and fox. But her world is sent spinning when an atrocious serial murder - where the victims have had their internal organs gouged out - is uncovered. Detective Min Woo believes the murders may relate to the organ trafficking trade, and goes undercover in a seedy organ smuggling ring. But Min Woo's cover is blown, and it's only through the intervention Nine-Tailed Fox warrior Mu Young and Shi Yeon that he's able to survive! But he's seen their true identities as Nine-Tailed Foxes…can he be allowed to live?

Son is a young detective that was born with a gift to see spirits. He often uses his gift to solve case. One day, Son uses his gift in the middle of the market and is sent to see a psychiatrist. The moment he meets Rung, they immediately dislike one another. Son is able to pass all mental evaluations, but because of her own prejudice, Rung reports that he is not ready for a mental evaluation.

When an extra gets hired to act like she has a crush on a CEO, the pretend romance becomes all too real. Wen Xiaonuan has been trying to make ends meet in order to support the Huangmei Opera Troupe. Resorting to acting gigs to earn money, Wen Xiaonuan books an unusual job where she must pretend to have a crush on the handsome CEO Ye Feimo.

Toda and Miura play two teachers, Natsumi Uemura and Shuji Kashiwagi, at the same high school who are set to get married in half a year. However, the night before the school year's opening ceremony, Shuji becomes involved with the young Hikari Saeki (played by Takei), without realizing that she will be a student in his class starting the next day. As Shuji struggles to help Hikari deal with the mental complex she is suffering from, he is also torn inside by his betrayal of Natsumi. Meanwhile, Hikari attempts to get closer to Natsumi, driven by feelings of jealousy and a desire to destroy the couple's relationship.