Best Ecchi Anime of 2006

Louise Françoise Le Blanc de La Vallière is a proud mage in a world defined by wands, cloaks, and nobility. She attends the esteemed Tristain Academy for mages but fails at casting spells correctly, earning her the mocking nickname "Louise the Zero" from her classmates. During the required first-year familiar summoning ritual, Louise's attempt produces a massive explosion. Everyone dismisses it as another failure, but when the smoke clears, Saito Hiraga appears. He is treated like a slave, forced to clean Louise's clothes and eat off the floor. However, a strange mark resembling the legendary familiar Gandalfr appears on his hand, hinting that he is no ordinary summon. In this wild, adventurous, and explosive tale, Saito must adapt to his new life while Louise discovers she is far more than her humiliating nickname suggests.

Air Trecks—AT for short—are motorized, futuristic inline skates that have become the latest nationwide obsession. Though each AT includes a speed limiter, a group of risk-takers calling themselves the "Storm Riders" boldly disable the device. They use the skates in underground contests where rival teams wager valuable AT parts or their team emblems, symbols of pride, in battles to dominate the streets. In this world lives Itsuki Minami, a middle schooler infamous for brawling in street fights. Driven by a relentless desire to soar higher than anyone else, the reckless punk smashes through any obstacle in his path, alongside his closest friends Kazuma Mikura and Onigiri. When he stumbles upon a pair of Air Trecks at home, the gateway to his true ambition finally opens: to conquer the skies.

Kawahira Keita comes from a long line of Inukami tamers, but because he lacked the necessary skill, his family abandoned him. One day, an Inukami named Youko appeared before him. She looked elegant, obedient, and above all, beautiful. He quickly formed a contract with her, and she pledged her loyalty to him. However, she turned out to be a troublesome Inukami that no one had ever been able to control. This is a slapstick comedy about an Inukami tamer, Keita, and an Inukami, Youko. Keita is a man driven by worldly desires, with a strong fondness for money and women. On the other hand, Youko enjoys destroying things and is extremely jealous.

In this sequel, Kazusano Kazuki, a girl, joins the six girls and Ikko. Because of Kazuki's presence, Ikko will end up in even more embarrassing situations with these priestesses-in-training.

Kazuki has spent a decade anticipating the return of her neighbors to their former home. She harbors a crush on Yuuji, viewing him as her first love, though she never found the courage to confess before he left. In their childhood, Yuuji frequently visited to play with Kazuki, her older sister Hatsune, and Yuuji’s sister Marie. However, her idealized image of him is quickly shattered upon their reunion, as he behaves in an unexpectedly ecchi manner. With their parents away in South America, the two families must adjust to living together and reconnect with the feelings they shared in the past. The situation becomes even more chaotic when they end up attending the same school.

Eriko, along with her friends Yuma and Ayano, is thrilled to begin their high school journey. Their enthusiasm gets the better of them, leading to a rule violation when they sneak a tour of the campus before the official opening ceremony. During this visit, they discover that their initial assumptions about the all-girls school might not be entirely accurate. Nevertheless, Eriko and her companions meet new people and form additional bonds. Together, they look forward to navigating their high school experiences as a close-knit group.

Renkin San-kyuu Magical? Pokaan chronicles the everyday experiences of four young girls who are far from ordinary. This circle of friends comprises Liru, a spirited werewolf; Uma, a cheerful witch-in-training; Aiko, a maternal android; and Pachira, a charming vampire. In reality, they are princesses from the netherworld who moved to the human world seeking a new residence. However, their innocence and ignorance make coexisting with humans far more challenging than they anticipated. While trying to adjust to their new lives, the group creates various problems and draws the suspicion of Dr. K-Ko. This scientist assumes the newcomers are plotting mischief and tries to capture them to validate the supernatural and earn respect from the scientific community. Each day offers fresh adventures as the girls navigate Dr. K-Ko’s schemes and the wonders of the human realm.

Eleven-year-old Sara Werec's older brother, Ralph, was deployed to the front lines of an interstellar conflict 130 light-years away, and she promised herself that one day she would stand beside him as a fellow soldier. Five years later, Sara is enrolled at the Grapera Space Armed Soldier Academy, training to become a Reasoner—the pilot of an advanced weapons platform known as a "Strain." When enemy forces launch a sudden assault on the academy, Sara engages in combat against another Strain that swiftly overwhelms her. After disabling her craft, the pilot reveals himself to be her brother Ralph. He slaughters all the other students and destroys the school before disappearing, leaving Sara to doubt everything she once believed. Soukou no Strain follows Sara as she resumes her training under a different identity, now resolved to confront her brother and understand the reasons behind his actions.

Haruma Kawagoe grew up as an only child. Many years ago, around Christmastime, his mother suffered a miscarriage of the baby who would have been his little sister. That night, a young Haruma knelt and sincerely prayed: "Please make my mother healthy again, and please give me a little sister." As time passed, Haruma all but forgot that prayer. But Santa did not forget... one Christmas, when Haruma least expects it, he receives an unusual gift—his sister.

One year has passed since the events of the OVA. The war left Kabuki-cho in ruins, causing the owner to shut down his lingerie pub, "Pallion," and open a new establishment called "New Papillion" in Akihabara. Tsubomi, along with her friends Anne and Shizuku, lost their memories during the conflict and started fresh in Akihabara. Meanwhile, the Susano—aliens seeking to invade Earth—reappear. They transform a UMA (Unidentified Mysterious Animal) into a monster and send it to attack Akihabara. Rama the cat helps Tsubomi and her companions regain their memories, leading them to fight the monster as the Lingerie Soldiers.