Houki Shinonono (篠ノ之 箒, Shinonono Houki) is a 1st year student at the IS Academy in Class One and the 1st childhood friend of Ichika Orimura. She is the 1st heroine to be introduced in the Infinite Stratos series.

Houki's appearance is a young teenage girl with long black hair and a green base ribbon with black stripes tied around her hair as a ponytail (later white base and red stripes in episode 12), and parted at her forehead, she has dark blue eyes, and usually wears her IS Academy uniform with high stockings that creates a Zettai Ryouiki. She is also seen wearing a kendo uniform. At first her IS training uniform matched the standard one that all other female students used but after gaining Akatsubaki she changes to one that is dominantly white with a black neckline and black edges on the legs.

In the light novel, it states that she is very well-endowed, as she was once complaining about the size of her breasts being too big, only to think to herself that maybe Ichika likes that. Tabane also comments on her growth in that area before getting hit on the head with a bokken.

IS (Japanese: IS〈インフィニット・ストラトス〉 Hepburn: IS ) is a Japanese light novel series by Izuru Yumizuru with illustrations provided by Okiura and CHOCO. As of October 2013, 8 volumes have been published by Media Factory under their MF Bunko J label. From volume 8 onwards, the novels will be published by Overlap under their Overlap Bunko label. A manga adaptation by Kenji Akahoshi was serialized in the seinen manga magazine Monthly Comic Alive from May 2010 to July 2012 with five volumes published under their Alive Comics imprint. A 12-episode anime adaptation aired in Japan between January and March, 2011, and an OVA was released on December 7, 2011. The anime is licensed by Sentai Filmworks in North America, and they released the series on April 10, 2012. A second series aired from October 3, 2013 to December 19, 2013.