Twice maknae line, Tzuyu, Chaeyoung, and Dahyun has been accidentally become a baby for 30 days after they drink a juice that has a sample for becoming young. They receive it from a scientist named Prof. Furi.  The only solution of this is to wait 30 days for them to come back to normal.  Can the Twice Unnie line successfully became their guardians as well as find the scientist who done it to them or not?

Sakura and Nako who are Yankees in Shekarashika Commercial School have been thrown to IZ University by their own parents. As much as their love of being yankees as well as their stage Name as Sakura and Namaiki(Nako), they have to learn how to be a normal student as well as learn to be a normal person, without having a fight with anyone.

The case of the baby potion have been spread around Korea and Japan. It makes the people shock and give confusion to everyone. As soon as Professor Furi work in an antidote. Another group became a victim once again.  This time... Its not only 3 members who was victimized, its 4. The problem is, Professor Han have a new partner in crime and the worst thing is... He and that person planned something worser than what he did to Tzuyu.  What if... The 01's line members of IZ*ONE Ha