Akuyaku Reijou wa Mou Zenbu ga Iya ni Natta no de, Kioku Soushitsu no Furi wo suru Koto ni shita

Cecilia, the daughter of a duke, wants to please her fiancé, the first prince. I heard that his favorite woman is the villainess from the story. He was acting like a sea urchin. However, her efforts are in vain and the first prince tells her to break off the engagement. She became so desperate that she hated everything, so she suddenly did something. Is that pretending to have amnesia? While the family is in turmoil, the second prince Six, who is worried about Cecilia, visits...? Starting with (pretended) memory loss, A love story of a serious but slightly eccentric young lady!