Kyoudai hodo Chikaku Tooimono wa Nai

Ane is the student council president, known for her beauty and intelligence. However, she becomes overly obsessed with her younger brother, losing control in her behavior around him. Their lives become increasingly chaotic due to the presence of several eccentric individuals, including a mentally unstable best friend, a younger sister with a sister complex, a former punk store manager, a devoted masochist, a loli-con, and others.