Sukina and Touma are the female protagonists in the anime White Album 2. They got this title because they are devoted to the male protagonist and they are competing for the male protagonist.
Sukina, female, is a character in the Japanese comic "Yu Yu Hakusho" and its derivative works.
"Yu Yu Hakusho" is a juvenile comic work serialized in Shueisha's magazine "Weekly Shonen Jump" from December 3, 1990 to July 25, 1994 by the Japanese cartoonist Yoshihiro Togashi. 175 chapters (including one side story). There are currently 19 single volumes in circulation, and the electronic version is published by Manfan Comics and Bilibili Comics.
This work was originally named "Yu Yuki", but the name was too similar to another work serialized at the same time, "Jin Yuki" by Manga Taro, so it was renamed "Yu Yu Hakusho". This work won the 39th Shogakukan Manga Award for the Shounen Division. During the serialization period, it was listed as one of the three representative comics of "Weekly Shonen Jump" in the mid-1990s along with "Dragon Ball" and "Slam Dunk".