Series by いづみかつき

Toru Sawada, a high school freshman, is thrown into chaos when he discovers that his real aunt, Kanko Ataka, who is the same age as him, has enrolled in his school and moved into his home. Despite her stunning beauty, Kanko hides a wild past as a notorious delinquent known as "Medusa," whose temper flares when anyone but family calls her "Oba-san" (Auntie). As Toru navigates the hilarious and tumultuous daily life with his unpredictable aunt, he faces school antics, family secrets, and the chaos of living with a former yankee.

Akashi, a delinquent high schooler known as the "Red Demon" for his fierce reputation, has always scared others away, especially the girls he's liked. Growing up, he used his fists to protect those he cared about, but his intimidating presence has left him isolated. That is, until Kiko Shirakawa, a beautiful and fearless girl, enters his life. Unfazed by Akashi's reputation, Kiko's kindness and unique charm draw him in, but she harbors a secret that adds an unexpected twist to their growing bond.