Talks of buying out the company (Robotics Suit) that Dr. Yamashina and his affiliates are on the table. Kai Aito, is a young, 30-year-old management genius with assets worth 5 trillion yen. "If you help me realize my vision, I'll give you anything you want, Dr. Yamashina." Attracted by Kai's lethal looks and abilities, Yamashina asks for his "genes" and requests a donation of his sperm or cells for research and development. Kai is made a shocking request by a man he's just met...!?

A spin-off of Haru wo Daiteita!

(Source: Libre, translated)

Note: Includes one extra chapter.