Oto no Nai Ame wa Furitsuzuku

After the death of their mother, Akira and his younger brother are taken in by their previously unknown father, who is the chairman of the influential Kasuga group. A man named Hyougami, acting on the father's behalf, brings the brothers to live with him. The company exerts control over many aspects of life, shaping the brothers' new circumstances. Akira discovers that Hyougami is manipulating his life and will stop at nothing to achieve his goals.