Adaptation of Takashi Noguchi's manga, which itself adapts Baku Yumemakura's supernatural romance novel. The original novel is about a 12th-century man named Minamoto no Yoshitsune (Kurou). Kurou flees into the mountains after losing to his brother Minamoto no Yoritomo, the first Shogun to rule all of Japan. History records that he committed suicide, but instead, Kurou meets a strange, beautiful woman named Kuromitsu in her mountain hermitage. Eventually, Kurou falls in love with Kuromitsu, but then realizes she conceals a dark secret. He learns that he is unable to die and continues to live for a thousand years as Japan evolves into a future society.

When Keita Suminoe's father remarried, not only did he gain a new mother, but elder twin sisters as well. Distinct yet similar, the homely and mature Ako is a former student council president, while the athletic and aloof Riko is the previous disciplinary president. The three of them have been together since kindergarten, resulting in a deep bond between the siblings. However, over time, their relationship developed into something more romantic—and erotic . Now in his last year of middle school, Keita has already received a sports recommendation, but it's from a different high school than his two sisters. Disappointed, both sisters try to change his mind, and he agrees, giving in to their desperate pleas. Unaware of the consequences, he now has to attempt to study for his high school exams while warding off the advances of his lust-driven sisters. With their parent's blessings, Ako and Riko strive to be Keita's future wife, leaving him to try his best to keep the relationship between them strictly platonic. However, with two beautiful girls vying for his attention, will Keita be able to withstand the endless temptations? [Written by MAL Rewrite]

One day after school, Asahi Kuromine stumbles upon the truth that Youko Shiragami, the girl he has a crush on, is actually a vampire. According to her father's rules, Youko must now quit school in order to keep her family safe. However, Asahi does not want her to go and promises that he will keep her true nature secret. Unfortunately, this turns out to be easier said than done, as Asahi is a man who is easy to read and is unable to keep any secrets to himself. And this is the only the beginning of his troubles—more supernatural beings enter his life, and he is forced to protect all of their identities or face the consequences. Jitsu wa Watashi wa follows Asahi as he deals with his new friends and the unique challenges they bring, struggles to keep his mouth shut, and desperately tries to win Youko's heart in the process. [Written by MAL Rewrite]

An extended version of the second season's first episode, which is under the same title.