Synopsis:

Why are you saying goodbye to me?

The cold-eyed transfer student was his ex-girlfriend!

In junior high school, Richi is the secret lover of a beautiful, aloof girl named Shibuya Nairu. After school, they spend sweet and intimate time in a biology room they keep a secret from anyone, but Nairu moves to another school and unilaterally says goodbye to Richi.

(I became classmates with awkward people, and the chair was next to me.)

After becoming a high school student, I couldn't help but notice it while ignoring the fact that she became more mature and beautiful. On the other hand, Richi repeated meaningful statements while turning the cold side of his face into an intellect.

The mesmerizing memories, bitter, sick, and sweet feelings that came back the more Richi tried to leave.

Due to Senior's eccentric tactic, Saeki Saoko, the two of them have to hatch "dinosaur eggs", and they will become increasingly aware of each other.

Before long, Richi comes into contact with Nairu's true feelings and the "truth" of the lost days...