Hime ga Taisetsu Sugiru Chou Katabutsu Kishi no Risei ga, Biyaku de Kekkai Shimashita.

In the Kingdom of Alterra, Princess Liina is hopelessly in love with her devoted personal knight, Noah. Day after day she openly expresses her feelings for him, but the earnest, strait-laced Noah never seems to notice. He remains the perfect knight—loyal, serious, and utterly focused on his duty to protect her. One day during a festival, Liina receives a mysterious "secret elixir that draws out one's instincts" from a strange fortune teller. Wanting to know how Noah truly feels about her, she honestly asks him to drink it. Convinced it must be a fake, Noah swallows the potion—and the love and desire he had suppressed with his reason suddenly run wild, and he pushes Liina down before him. Frightened by the strength of the transformed Noah, Liina finds herself caught by the waist and unable to escape. His hot breath and overflowing instinct and reason from behind—is it because of the elixi…