Honkai Impact 3rd: Starting with A-Quan's Version of The Last Lesson

One day, characters from all the factions in the world of Honkai Impact 3rd arrive in a mysterious projection space,

where they watch a series of unbelievable videos...

For example, The Last Lesson, from the start, featuring A-Quan~

Kiana: Why does this teary-eyed Herrscher look so much like me?

Then there's the story of how you came to be, featuring Dad~

Thirteen Flame-Chasers: What is this thing?

And a version of Thus Spoke Apocalypse where both sides are equally devoted.

Otto: Ah~ Kallen, Kallen, Kallen, Kallen!!!

Then there's Sinner's Elegy, the Dragon Rider version~

Kiana: Ah, it's Kamen Rider~!

Mei: Oh no, that feeling is coming back!?