Okay Cake. First of all I wanna say welcome online C:.
Okay now for the update.
When the invasion started, these body-less soldiers came in terrorizing the school and attacking things which held a sword and a shield and each a seal tryton gave them.
UhhhDavidx3

A huge group of body-less suits of armor came marching towards the entrance, equipped with swords and shields and a seal. Inside the armor held purple aura flames floating towards the top. The group was a huge countless crowd that continued marching towards they reached the entrance. They then started to scatter in a charging motion around the school.
After that students and teachers started fighting them off.
That's when Alice, the swordswoman, Ten, John and Mimi appeared.
John found Haru and started fighting her where Shadow tried to assist until John said somethings that affected Haru and wanted her to fight John alone
Alice was waiting for Minus and Lilith to appear at the school until she noticed Angel and Lake (the two guys from the tournament) fighting off the soldiers and decided to attack them. Thats when Musubi had a plan at defeating her, but all three failed miserably at fighting Alice and are all knocked out.
Ten was with Rumia at first in the library until he escaped and got on top of the roof to fight Patchouli, Utsuho, and Suwako, but Suwako decided to fight him alone which they are near the front of the school now.
Mimi was hiding so she could find Orochi herself, but she was caught when she was hiding in one of the soldiers shields. The shield fell and Jon caught her and tried fighting her. It came to the point where Dev had to assist him in which the both of them are fighting and Mimi had a tranformation.
In the school Henry is looking for the jewel. and Alice sealed the infirmary so both Lilith and Minus can go in, but no other can.
So far I believe that's it. I hope this helps C: