A chick bought to commemorate a date between Keisuke Yamato and Ami Ninomiya. By the end of the series, it grows into a rooster. The chick was named by Ami's roommate, who wasn't aware of Ami's hated of Yamato family and Keisuke in particular. When written in kanji, the kei (鶏?) can be read as "chicken" and suke (助?) as "rescued", so its name can mean "rescued chicken". Keisuke appears on the spine of the bunkoban editions of the Rough manga. (Source: Wikipedia)