オイ!!オバさん

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. (Unreviewed summary by Grok 2)