The first extra of volume 2 is the first chapter of Love Equation.
~Not Ready? Sensei~
Murakami Hiroshi makes a living out of drawing yaoi manga, though he claims not to be gay. He has a girlfriend, yet regularly sleeps with another man, and even seduced his assistant. His sex life’s a mess… will he ever figure out what… or who he wants?
Vol. 1 Ch. 2 (Part 2): Side Story
Vol. 2 Ch. 2: Unbalance