Mika Mikashima is the female protagonist of the first episode of the anime Eternity: Shinya no Nurekoi Channel. She is a twenty-nine-year-old translator and novelist who has built a stable, independent life for herself and had come to accept the possibility of living alone indefinitely. That outlook changes when she participates in a matchmaking meeting and meets Shiho Mikashima, a tall and highly regarded security professional. Initially Mika views herself as an unequal partner compared to the charismatic Shiho, but she is surprised when he speaks to her gently and proposes marriage. The story follows Mika as she navigates the uncertainties of that sudden proposal and begins a new relationship with Shiho, exploring her feelings of inadequacy and gradually opening up to the possibility of a shared future. Her character embodies the theme of finding love unexpectedly later in life, and her professional identity as a writer and translator is a key part of her background, reflecting her introspective and independent nature. Mika's development centers on moving from self-doubt and resignation to embracing an unexpected romantic connection.