Also known as: 二木四季, 二木さん, 二木, ポテンシャルさん, Futaki_Shiki
Also known as "Emoji Mk 2/2.0". Gamer girl and one of Kuroki Tomoko's classmates, she dreams of one day making a living out of playing video games.
She and Tomoko eventually befriend Yoshida Masaki's cohorts Anna and Rena, and in later chapters can be seen hanging out with them after school.