Marriage with her childhood friend has been decided, and Tsubaki is in the middle of her happy life. However, something suspicious suddenly appeared at her wedding - and when she woke up, she had become a baby! It seems that He tries to think back on the cause of Tsubaki's death, but he can't figure it out at all. Millie is determined to enjoy her new life because she can't help it. ! Milly receives the full attention of her gorgeous family. Just when she thought her days were peaceful, an unexpectedly harsh fate awaits her. The long-awaited comic version of the heartwarming and sometimes suspenseful (!?) fantasy of a beloved little girl in another world!