These are message cards made by mocolier, a Japanese manufacturer of stationery and paper goods.
The card that you will want to gently add to a simple gift.
The illustration of the flowers is not too cute and blooms casually.

The following is a quote from mocolier's product description
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Die-cut message cards that can add a subtle touch of color to a festive occasion.　
There are 14 cards with a total of seven different patterns featuring pink, yellow, and blue flowers, and six sheets of vitamin-colored tracing paper.
They come in a special paper case for easy portability.
The backs of the cards are thinly ruled, making them ideal for adding a small message or for accenting a gift.
The cards are thick, so there is no need to worry about the backs of the cards being smudged, and the paper has a rough texture that makes it easy to write on.

-Contents
20 cards per case (14 cards and 6 sheets of tracing paper)
-Size
Card: 6-7cm, Case: 12cm x 12cm