Hidden in plain sight, spirits known as youkai inhabit the world. While most are benign, a certain subset threatens the tenuous peace between youkai and humanity. Ever since she agreed to become their God of Wisdom, Kotoko Iwanaga has served as a mediator between the two realms, resolving any supernatural problems that come her way. At a local hospital, Kotoko approaches Kurou Sakuragawa, a university student whose long-term relationship ended with an unfortunate breakup. Kotoko harbors feelings for him and suspects that something supernatural lurks within his harmless appearance, so she asks Kurou for his assistance in helping out youkai. Two years later, news of an idol who was accidentally crushed to death by steel beams flooded the press. However, months later, sightings begin to tell of a faceless woman who wields a steel beam. As is the case for any supernatural problem, Kotoko and her partner set out to stop this spirit from wreaking havoc—but this case may prove to be far more sinister and personal than they could have ever thought.

Seirei Academy is a prestigious school attended by the very best students in Japan. Alisa Mikhailovna Alya Kujou, the half-Russian and half-Japanese treasurer of the school's student council, is known for her intelligence, stunning looks, and rigid personality. Contrasting her near-flawless persona, Alya's unmotivated classmate Masachika Kuze slacks off during lessons and seems to show no interest in her. Initially irritated, Alya gradually becomes more intrigued by Masachika and starts expressing her affection for him in Russian. However, she is oblivious to his secret—he understands the language fluently! Due to a childhood friend who was temporarily staying in Japan, Masachika has been studying Russian in hopes of reuniting with her. As the two spend more time together, the playful and eccentric relationship between them quickly deepens. In the meantime, both must learn to navigate their new growing feelings for one another.

As close encounters of the twisted kind between the residents of the planet Develuke (represented primarily by the female members of the royal family) and the inhabitants of Earth (represented mainly by one very exhausted Rito Yuki) continue to escalate, the situation spirals even further out of control. When junior princesses Nana and Momo transferred into Earth School where big sister LaLa can (theoretically) keep an eye on them, things SHOULD be smooth sailing. But when Momo decides she'd like to supplement Rito's relationship with LaLa with a little sisterly love, you know LaLa's not going to waste any time splitting harems. Unfortunately, it's just about that point that Yami, the Golden Darkness, enters the scene with all the subtleness of a supernova, along with an army of possessed high school students! All of which is certain to make Rito's life suck more than a black hole at the family picnic. Unless, of course, a certain semi-demonic princess can apply a little of her Develukean Whoop Ass to exactly that portion of certain other heavenly bodies! (Source: Sentai Filmworks)

The Kazama Family—a gang of three wannabe delinquents and close friends, spearheaded by Kenji Kazama, is trying to make a name for themselves at Fujou Academy. On the first day of the term, the gang finds themselves putting out a fire in the Game Development Club. Instead of thanking them, the eccentric club members attack and knock out Kenji's two friends, forcing Kenji to fight for his life. Failing to escape, the gang leader is coerced into joining the Game Development Club. As he settles in, Kenji gets to know the four girls responsible for his provisional membership—student council president and general tyrant Chitose Karasuyama, spirited tomboy Sakura Mizukami, negligent club advisor Minami Oosawa, and the school's infamous shadow leader Roka Shibasaki. Throughout the Game Development Club's constant shenanigans and his desperate attempts to leave the club, Kenji begins to realize that he may be actually enjoying himself.