Arknights: the Daughters Come from Fifteen Years Later

[Free yourself, daily, invincible, no knife, take care of the baby (doubtful)] It has been almost a year since Kukai Mei and Meng Ling traveled to the continent of Terra They solved many incidents and formed incomprehensible relationships with many operators. So far, they have lived a fulfilling and interesting daily life on the land of Terra. Until one day, two strange but familiar little cuties suddenly appeared "Hello moms, we are from the future fifteen years later."