Kyousuke Kousaka, a normal seventeen-year-old high school student, hasn’t gotten along with his younger sister, Kirino, in years. For longer than he can remember, Kirino has ignored his comings and goings and looked at him with spurning eyes. It seemed as if the relationship between Kyousuke and his sister, now fourteen, would continue this way for…

Tatsumi is a high school boy who lives by himself. However, a devastatingly handsome merman named Wakasa moves into the bathtub in Tatsumi's home. Wakasa is a bit self-centered but cute, while Tatsumi is cool but a busybody.

Eita enters high school aiming for the National University School of Medicine. Because of his parents’ divorce—and his goal—he shuns anything to do with romance or love. One day, Masuzu, the school beauty with the silver hair who has just returned to the country, enters his life in a most unexpected way. Chiwa, his childhood friend since elementary school, will not let this go without a fight.

An OVA bundled with the non-adult version of the OreTsuba PC game. The OVA has more fan service than the TV series (what they call, "nakedness plus 90%").

An OVA bundled with the non-adult version of the OreTsuba PC game. The OVA has more fan service than the TV series (what they call, "nakedness plus 90%").

Haneda Takashi has a secret he cannot speak of. To leave his dull school-life, he was supposed to have escaped to another world. However, he is reeled in by certain ties on his heart. One of these is Kobato, his awkward younger sister. The other is Watarai Asuka, his negligent girlfriend. Chitose Shuusuke is a poor freeloader. He passes his days working at various part-time jobs. One day, he has a disastrous first encounter with Tamaizumi Hiyoko. The next time they meet, Shuusuke discovers that they are fellow employees at his part-time job. Narita Hayato sees himself as a "hard-boiled" person. Back-breaking jobs are nothing to him. Hayato shuns normal human contact, but, during the nights, he would get together with delinquents and other denizens of the night. One such night, he meets the cheerful and oblivious Otori Naru. The relationships with these girls will greatly affect these 3 young men. But what, exactly, is the relationship these young men have with each other?

Five years ago, Musashi made a promise with his friend Kojirou Kanemaki that once they grew up, they would become samurai, form a league, and go on demon-slaying quests. But since then, things have changed. With demons now being praised and worshipped by society, the samurai are shunned and disgraced. Afraid of revealing his dream of becoming a samurai, Musashi blends into the town's dogma by becoming a miner while secretly polishing his swordsmanship. Meanwhile, despite being a direct descendant of a samurai, Kojirou gives up on his promise to his old friend. However, after saving Musashi from a near-death experience, his perspective shifts. Although still conflicted, Kojirou embarks on a journey with Musashi in the hopes of figuring out his true feelings. Fighting against all odds, the duo dives headfirst into the unknown world of beast-slaying, not knowing what life has in store for them. Now astride iron horses, the fifteen-year-old heroes plan to restore the tarnished reputation of the samurai and purge the world of demons.

Freed from the rule of samurai 150 years ago, the people of Hinomoto live peaceful lives and revere their liberators—demons whose true forms remain elusive—as gods. Fated to mine rocks for the demons to feast on, Musashi knows the grim truth: humanity is enslaved by these otherworldly beings and the samurai are the last bastion fighting for freedom. Hiding his true opinion from his peers and growing distant from his childhood friend Kojirou Kanemaki, Musashi lives in angst until the day of his graduation. When the fresh graduates arrive at the mine, they are horrified to see the inhumane treatment of miners and the uncanny physical appearance of their overseers. However, Musashi manages to endure thanks to Kojirou's help. As the demon leader wreaks havoc on the quarry, Musashi is saved once more from certain death by the Takeda samurai clan. Recovering from humiliation and yearning for adventure, Musashi embarks on a journey to become a samurai and form his own clan!

Second cour of Orient, adapting the Awajishima Gekitou-hen (The Battle of Awaji Island arc).

The ferocious battle of Awaji Island begins now! With the appearance of the all-powerful Kishin, the land of Hinomoto is now dominated by oni, instead of humans. Musashi and Kanemaki Kojiro set out from their hometown swearing the form the strongest Bushi band of all time, and after encountering Hattori Tsugumi on their trip, the three of them found the Kanemaki Bushi. After obtaining the only weapons that can slay oni, Kitetsu Blades, they have taken the first big step towards their dream. In Harima, Musashi's group will encounter the massive band of Uesugui Bushi, and their leader Uesugi Tatsuomi. They have gathered to slay the giant Kishin that threatens to consume the Awaji island: Yamata no Orochi, the Artillery Wyrm. Joining them are Takeda Naotora and the Takeda Bushi, along with several Bushi the same age as Musashi like Shimazu Akihiro and Amako Katsumi. There's also the slightly sheltered, shy princess, Saruwatari Michiru. As different agendas swirl and interact, Musashi and his friends join the Kishin hunt. Yamata no Orochi is an unstoppable demon god that's never been scratched before. And so, the fiercest battle of all begins...

A failed DNA experiment with plants has changed the world forever. Having demolished the moon, the intelligent and aggressive plant-life has spread to the earth and destroyed the human civilization. The few humans that remain struggle to survive, while maintaining an uneasy truce with the restless forest. One day, a villager named Agito stumbles across a stasis unit hidden deep in the forest and awakens a very cute girl from the past. Having slept for the past 300 years, Toola steps into a very different and strange world. The neighbouring high-tech village of Laguna is still locked in a bitter war with the forest and when they become aware of Toola, they realize that she is the key to activating her father's final and ultimate weapon of humanity - a weapon designed to totally destroy the forest. When Toola is taken by the warriors of Laguna, Agito makes a pact with the forest to gain the strength and incredible powers to not only save her, but to stop the weapon from destroying both the forest and his village.

Akutsu Masatora is a demon who has infiltrated a high school in the human world. His goal is to find candidates to aid Hell in the fight against their natural enemies, the angels of Heaven. Assigned a seat next to Lily Amane, another student who transferred here not long ago, Akutsu falls prey to her beauty and decides to recruit her to his cause. But there's more to Lily than meets the eye, and Akutsu not only finds himself an accomplice to one of the very enemies he is supposed to defeat, but he also might have developed feelings for her.