A Love-Distrusting Noble Lady Doesn't Notice the Cold Knight's Devotion Manga
Renai Fushinna Reijou wa Reikoku Kishi-sama no Dekiai ni Kizukanai / 恋愛不信な令嬢は冷酷騎士様の溺愛に気づかない

One day, Countess Rosalie witnesses her lover, Hayden, cheating on her. Heartbroken, Rosalie becomes timid about love. However, she is then proposed to by the dashing future Marquis, Rufus…!? A school romance story between a love-challenged young lady and a notoriously cold knight!