Prime:
>Make 2 Permanent clones and 2 regular clones and materialize them near said bubbles, with the permanent ones being with Koishidai-chan and Rikadai-chan's.
>Have them touch their bubbles and rename themselves after the Dai-chan from which the memories are.
> Turn this into two manifestations and two Koa clones, one of each new manifestation.
> Have the new manifestations become RenBug and MerryBug, and have the two Koa clones become KoishiDai and RikaDai.
//Everything else is "fine". I still think this is generically a bad idea because I can see plenty of ways in which this damages our relationship with Koa further, but I can tell at this point that you don't care enough about that to be stopped.
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> Manifest a new self near the ghosts.
> Using the necessary resources, identify which ghost corresponds to Myon, the clone formerly inside Youmu's ghost half.
> Once we have done so, fly toward it and touch it, avoiding touching any other ghosts on our way. Name ourselves Myon if we succeed in touching it and regain Myon's memories.
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Prime (Home):
> "Huh...hey, Koa, do you wanna see these ghosts? It's kinda neat, in its own morbid way."
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HamiDai:
> "All of Dai's clone memories came back as ghosts for some reason! She's recovering them now and I'm your Dai! I'm back, Hamiya!"