Irita serves as a crew member aboard the starship Arcadia. During a critical battle against the antagonistic force known as the Fata Morgana, which threatens the ship and its crew, Irita confronts the enemy. This combat unfolds while the crew struggles to save the Arcadia without support from its onboard computer systems.

In a pivotal act, Irita sacrifices her personal survival to implant a tracking device onto the Fata Morgana. This selfless action enables Captain Herlock to trace and pursue the ancient cosmic entities called the Noo, who are central to the conflict. Irita's sacrifice directly contributes to the crew's strategic objective of countering the Noo threat.