Aikawa Arashi is a well-known female killer in the school. According to rumors, he has dated two-thirds of the girls in just one year after entering school. His sister Aikawa Umi is equally famous. Although she is among the best, she always has a smile on her face, but she always feels unapproachable.
But in school, no one knew they were siblings...
Concept: Emotional relationships involving blood relationships are constantly being cut and confused.