Recently, My Sister Is Unusual -

The series was famously picked up for international audiences by Crunchyroll , where it is available for streaming in various regions including North America and Europe.

The "TST" (Total Strategic Trapping) belt serves as the central plot device, driving the comedy and the tension by forcing Mitsuki into awkward situations.

Mitsuki becomes possessed by the spirit of a young, amnesiac ghost named Hiyori. To pass on to the afterlife, Hiyori must "ascend" by experiencing love and fulfillment through Mitsuki. The catch? Hiyori forces Mitsuki to wear a supernatural chastity belt that can only be unlocked by performing increasingly bold and romantic acts with her stepbrother. Why It Stands Out

The anime features notable talent, including Junji Majima (known for Toradora! ) as the stepbrother Yuya, as noted by Crunchyroll News . Where to Watch

It leans heavily into the "imouto" (little sister) tropes popular in the early 2010s, similar to series like Oreimo .

If you're looking for more recommendations or want to dive deeper into specific episodes:

Recently, My Sister is Unusual (Saikin, Imouto no Yousu ga Chotto Okashii n da ga.) is a notorious entry in the "little sister" anime genre that blends supernatural comedy with high-stakes ecchi themes. Originally a manga by Mari Matsuzawa, the series gained attention for its controversial premise and over-the-top fanservice. The Plot: A Ghostly Ultimatum

The story follows Mitsuki Kanzaki, a high school girl whose life is turned upside down when her mother remarries. Suddenly, she has a new stepbrother, Yuya, whom she finds difficult to bond with. However, family tension is the least of her worries.