Akira, as the director, oversees the entire production, which includes the roles of both Haruto and Saki. This establishes a supervisory or professional relationship of Akira with both Haruto and Saki. Haruto, as an actor, works with Saki, the costume designer, because Saki is responsible for creating and fitting costumes that match Haruto's character. Therefore, they have a collaborative relationship.

For the current play, Akira has directed Saki to collaborate with Keiko, the lead actress, suggesting Akira takes a higher-level oversight role while Saki is in a support role specifically for Keiko. This indicates that Saki has a direct working relationship with Keiko. Meanwhile, Haruto's relationship with Keiko can be inferred as that of a colleague since they are both actors in the same production. However, there is no direct mention of Haruto needing to work with Keiko in regard to costumes or other specifics. Finally, Haruto's relationship with Akira is that of an actor to their director, indicating that Akira provides guidance and direction to Haruto in his acting capacity.
Akira, Haruto, and Saki are members of a local community theater's production. Akira is the director, while Haruto is an actor, and Saki is a costume designer. Haruto and Saki often interact to ensure that his costumes fit the character he is playing. For the upcoming play, the director has assigned Saki to work closely with the lead actress, Keiko, who is not part of the initial group of three. How do the professional relationships connect among Akira, Haruto, Saki, and Keiko? Additionally, what is Haruto's relationship with the lead actress, Keiko, and with Akira? Provide a brief response.