Seijo ga Kuru kara "Kimi wo Aisuru Koto wa Nai" to Iwareta node Okazari Ouhi ni Tesshiteitara, Seijo ga 5-sai Datta node Zenryoku de Aishimasu!!

Synopsis

"The saint will arrive soon, so I will never love you." With those words from her future husband, Emperor Yuri, Edelene resigns herself to a quiet life as merely a queen in name only. However, when the saint is finally summoned, she turns out to be a 5-year-old girl, trembling in fear from a life of abuse! This marks the beginning of a heartwarming fantasy about family love, as the wounded young saint is showered with unconditional affection by Edelene and Yuri, growing up happy and healthy under their care. (Source: Mag Garden, translated)