These are chips that are flavored with Japanese apricot/plum (梅 - ume). I personally really don't like them, but it goes with a lot of traditional Japanese meals. Each of these have their own variation on the taste.

Faint plum flavor (ほんのり梅味 - honnori ume aji).

Plum kelp flavor (梅こんぶ味 - ume konbu aji).

Plum tuna/bonito flavor (梅かつお味 - ume katsuo aji), on what seems to originally be an edamame-flavored snack.
I think that's right. The last two just makes me really confused about the combination of flavors...
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Store: Lawson