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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Three different card designs featuring cherry blossoms and petals are packaged in a small cherry blossom-colored box.
The slim miniature size is easy to use and is recommended for everyday messages, business occasions, and casual seasonal gifts.
The cards are made of high quality paper with a texture that is easy to write on without the worry of backing.
The back of the card is white.

-Size
Card: 4 cm (length) X 9.5 cm (width)
Box outside dimensions: 4.5 cm (length) X 10 cm (width)
-Contents
24 cards per box (3 types of designs x 8 cards each)