- She had an interest in anime since her childhood, watching series such as Cardcaptor Sakura and Ojamajo Doremi.
- In pursuit of becoming a voice actress, Koga would take acting lessons at a vocational school in Fukuoka. Following this, she enrolled in the training school of the agency 81 Produce, becoming affiliated with them upon her finishing her training.
- In 2017, she gets her first major role as Sora Kaneshiro in Tenshi no 3P! and also became part of the band Baby's Breath along with Yuko Ono and Yurika Endou, her co-stars in the series.
- In 2019, she had her first starring role as Kaguya Shinomiya in Kaguya-sama: Love Is War.
- She appears in the Kaguya-sama: Love Is War live action movie where she plays one of the movie theater staff who serves Kaguya.
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