Pilot Iroshizuku Ink
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The Pilot Iroshizuku line has a certain flex to it, I think. Especially good for writing things that need to look like they have some flex.

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I bought these as gifts, obviously.
The ones I got were Momiji, Ajisai, and Murasaki-shikibu—red, light purple, and purple respectively.
The 15 ml version comes in a tiny bottle. Compact, no worries about wasting ink you’ll never finish, and the price is reasonable too.
Here’s a writing sample with Ajisai:

Not my handwriting. Mine’s too ugly, so I didn’t write one.
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