The Road to Sirius (2008)

Tatsumura Yusuke, a deputy sales manager at Toho Advertising, has a shared past with Akiko and Katsuya. A hidden truth connects Akiko, her father, and Tatsumura, surrounding the circumstances of the father's death. The three have drifted apart over the years, but 25 years later, Akiko receives an extortion letter that brings this secret back to the surface. Simultaneously, Tatsumura's division finds itself in a high-stakes competition for a 1.8 billion yen project. Working with Tachibana, Hirano, and Totsuka, Tatsumura strives for a successful pitch, facing internal sabotage and fierce rivalry from a competitor. He then discovers a connection between the project and the long-buried secret from his past.