- Voice Actor (CV)
- Saki Fujita
- Gender
- Female
- Birthday
- August 10
- Role
- Supporting
- Identity
- A third-year student at Misatonishi High School serving as Student Council President, and the older sister of protagonist Yuu Sonoda
Personality
Dutiful
Daydream-prone
Overprotective
Romantically naive
Mitsuki Sonoda is the older sister of the story's main character, Yuu Sonoda, and holds the prestigious role of Student Council President at their school. Known for her dependable and composed demeanor, she takes her responsibilities seriously—yet she can't help spiraling into wild imagination whenever she catches Yuu and Haruka in suspiciously close moments. Despite projecting an air of maturity, she is surprisingly innocent when it comes to matters of the heart. As she continues to observe the bond between Yuu and Haruka, she finds herself developing unexpectedly complex feelings toward Haruka.