To see Aniimo’s launch-story ending, reach the final battle against Lv. 50 Irelia at Tideblossom Coast and defeat her. The supplied video description says the encounter has multiple phases and is followed by ending cutscenes and an epilogue.
What the source confirms
The video is presented as an Android gameplay walkthrough without commentary. Its description identifies Irelia as the final boss and says it shows the battle and story ending. It does not provide a verified strategy, required team level, equipment, elemental weaknesses, or attack-by-attack instructions.
If you need help preparing for the fight, the available material does not establish which upgrades or party choices are necessary. Use the encounter’s listed level—50—as context, but don’t treat it as a confirmed minimum player or team level.
After defeating Irelia, continue through the ending sequence to see the launch story’s conclusion and epilogue.

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The explanation is clear, especially for beginners.
This helped me understand strategy much better.
This guide answered the exact question I had.
This saved me time in the early game.