My Friend''s Little Sister Has It In For Me! Volume 10 (Light Novel)

The first time Akiteru met his friends little sister, Iroha, she was soft-spoken, with a diligent air about her. So when he heard she was joining a gangone led by none other than Otoihe began to suspect there was more to Iroha than met the eye. When he intervened, things only got more complicated. But as a result, Akiteru formed bonds with unlikely friends for years to come. Its finally time to unravel the secrets of the Alliances past! How did Akiteru come to form the 05th Floor Alliance, and why did Iroha decide to make him the victim of her teasing?