Anata no Soba ni. (貴方の側に。)

My Happy Marriage: The Shape of My Happiness

Though hesitant, Miyo Saimori decides she is finally ready to attend a party with her fiancé Kiyoka Kudou. She has been practicing the etiquette needed for such an occasion with the help of Kiyoka's sister, Hazuki. At first, Miyo feels pressured by all the attention she receives; however, she eventually grows used to the unfamiliar environment and makes new acquaintances. Through these encounters, Miyo learns more about her family's past and the significance of creating connections with others.