Yarinaoseru Mitai nanode, Kondo koso Akogare no Jijo wo Mezashimasu!

The daughter of a viscount has returned to the past, and she intends to dedicate her second life to waiting on young ladies as the ideal lady's maid! The day after her engagement is called off, Emma returns to her life at the age of 15, having served her country thus far using her power to travel to the future. And this time around, she won't be sacrificing herself for the sake of the nation!

She's determined to fulfill her childhood dream of becoming a lady's maid when a mysterious duke from the neighboring country appears before her. "I don't waste my time on nonsense." But his kindness belies his cold words and Emma finds herself drawn to him. Yet he keeps a secret that could change everything...

(Source: Cross Infinite World)