Persona 3 FES: The Reason For His Death

That evil monster has been destroyed but the problem is the monster will never always be gone and it will come back as long as malice is in our hearts. This is why the he can never come back.
Yukari apologizes for the way she acted and they all feel much happier that he is there saving the world and them always.
They prepare to go back to their time and open the front door to April 1st.
It almost seems like Aigis is saying bye for good...it couldn't be..?