Rentarou (from 100 girlfriends) if he ever get isekaied late into the story:

I have 100 fiances waiting for me back on my planet.

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The way Lara is building relationships and learning common sense reminds me of Violet Evergarden. Such good writing.

Also, calling it now: for the climax, Lara would have to choose between her new-found human friends and her original mermaid family.