Minamoto is knocked unconscious while chasing a dangerous esper criminal and HyÅbu takes the opportunity to have him regress to his 12-year-old former self. Kaoru, Aoi and Shiho are assigned to keep Minamoto company and take the opportunity to spend some quality time with him while the others look for a way to have him return to normal. In the next day, they find that P.A.N.D.R.A. had occupied the school and brainwashed everyone there to make them believe that the younger Minamoto is one of its students. As Minamoto spends the day happily with the girls, he wonders if he could remain in his current condition indefinitely.