The OVA strips away BABEL's control and lets you see what the Children actually want when nobody's telling them what their powers are for. Hyoubu's already won the argument by this point, so all that's left is three kids trying to figure out who they are without an organization defining them. It's quieter than the TV series, more honest about what growing up as a living weapon costs you.
The three most powerful ESPers in the world are growing up. The Children, the special psychic team that works for B.A.B.E.L. to stop crimes before they happen, have now started junior high school. The story is set during the middle school period of Takashi Shiina's manga. One day the girls get an urgent message that B.A.B.E.L. itself is under attack. This single-episode OVA mixes superpowered action with comedy.