Sorry about the audio quality due to headphone being Broken ANd sorry for the lag or frame skipping due to shitty phone or tab i have lol.
Recommended unit/Support: Healer(Tomte, Summer chernobog, Fashionista Tsathoggua(Not recommended but you can choose if you want to), etc), Debuffer(Licho, Arachne, Canan Tangaroa)

About phase:
Wave 1(Aka I like debuff to anti-protect)
Since the army of the mob will bestow envision behind from the student(Well I think its the student mob do this). it's best to bring a Debuffer(Skill locker) to prevent it to use the skill. also, it's best to kill Aizen asap since it will heal the mob of them.
Wave 2(Eurobeat Phase Aka nomad helping your exercise by messing up your movement).
This might be annoying for beginner since nomad will deplete hp of your army and Make the movement randomly to your team. the strategy is either to kill him asap by via critter(By via picking a correct move slot) damage or survive till you have a chance to attack him.
Wave 3(Lol we died? fuck you. We have Guts. we won't give up till we mess you up)
this must be the most hated by me since Guts is really annoying to kill with. it's best to have a Debuffer(skill locker or double locker) to prevent it to have guts during the damage(After next turn)(This is why A remove buff unit is recommended to kill asap)(Not really necessary but ok)
Wave 4(Hai I m echo but stronger)
Echo almost has her skill set but which exceptional weapon changes(All range) to her allies(All to all slime nearby her). so its best to kill her asap.