File:Recently, My Sister Is Unusual OST - BINKAN ATTENTION

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Recently, My Sister is Unusual (最近、妹のようすがちょっとおかしいんだが. Saikin, Imōto no Yōsu ga Chotto Okashiin Da Ga., lit. "Lately, My Little Sister's Been Acting A Bit Strange, But."), also known as ImoCho (妹ちょ. ?), is a Japanese manga series by Mari Matsuzawa, serialized in Fujimi Shobo's Monthly Dragon Age since November 9, 2010. An anime television series premiered in Japan in January 2014. It was adapted into a light novel written by Kougetsu Mikazuki, which was published on January 18, 2014 under Fujimi Shobo's Fujimi Fantasia Bunko imprint. A live action film adaptation premiered on May 17, 2014.

High school girl Kanzaki Mitsuki "inherits" an older brother when her mother remarries a fellow divorcée with a son. Soon after, her new stepdad is transferred overseas and her mother follows him there, leaving Mitsuki to live alone with her new stepbrother, Yuya. Feeling abandoned by her mother, she stays distant from Yuya, never really getting along very well with him nor even keeping a conversation with him.

One day, Mitsuki is visited by an angel/ghost named Hiyori, who takes over her body and make sexual advances towards Yuya. Hiyori is the lost spirit of a girl who died but can not reach the gates of heaven and so obtain eternal peace. In order to reach heaven, Hiyori puts a chastity belt on Mitsuki that fills up every time Mitsuki has sexual feelings from Yuya, whether it be from simply going on a date with him, to kissing and even sex. For every time it fills up, Hiyori gains a step on a bridge that connects her current situation and the literal gates of heaven. If she wants to get rid of the annoying Hiyori, Mitsuki has to make some bold and sexy moves against her own brother, even if he is just a stepbrother.

An anime television series adaptation premiered on Tokyo MX and SUN on January 4, 2014. Additionally, the series is airing on AT-X and BS11 and streamed with English subtitles by Crunchyroll. The anime is directed by Hiroyuki Hata at studio Project No.9 with writing by Hideyuki Kurata and music by Ryosuke Nakanishi. An original episode will be released on Blu-ray Disc bundled with the limited edition of the seventh manga volume, scheduled to be published on April 14, 2014.

The show has become subject to a broadcast decency investigation in Japan by the Broadcasting Ethics and Program Improvement Organization, following concerns of sexually explicit themes which do not match the show's television airing time slot on Tokyo MX and Sun TV.

Mitsuki Kanzaki (神前 美月 Kanzaki Mitsuki) Voiced by: Chinami Hashimoto The title character, Mitsuki has been living with her stepbrother, Yuya since her mother's second marriage. She had a bad relationship with her real father, resulting in her cold view toward all men, without any exception. She's possessed and haunted by Hiyori's ghost and forced to help her pass on by helping her experience "lovey-dovey" situations with Yuya; if she doesn't Hiyori claims she'll die and go to hell with her. The possession caused a chastity belt to appear on her, which she cannot take off except in the bath and toilet, and then only at the moment it's absolutely necessary, after which it appears again. Played by Tenka Hashimoto in the live action film.

Yūya Kanzaki (神前 夕哉 Kanzaki Yūya) Voiced by: Junji Majima Mitsuki's stepbrother. An average Japanese high school student, Yuya's goal is to have a fine sibling relationship with his new little sister. He is generally good-hearted, but because he grew up without a mother and little companionship with females, he has an incredibly poor ability to understand and empathize with Mitsuki's feelings. He also has a tendency to make very inaccurate assumptions based on unusual circumstances, and despite his good intentions, his attempts to help Mitsuki often cause things to become worse, such as when she needed to go to the washroom, and he assumed she was sick and forcefully dragged her to the school clinic despite her protests. Due to his misunderstanding about Mitsuki's chastity belt and Hiyori, he believes that Mitsuki and Hiyori are a "lesbian cosplay couple".