Hitachiin Hikaru, Hitachiin Kaoru.
A pair of twin brothers entangled in male-female and immoral love.
They have entanglements from past lives and entanglements from this life.
Wandering on the edge of love and non-love, wandering in secular ethics.
The love between a brother and his best friend.
A younger brother's obsession with his older brother.
What kind of story will happen between them.