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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This memo letterhead set includes a set of small, square-sized letterheads and a special case for easy carrying.
The set contains 24 sheets of memo paper with a total of four different designs featuring spring, early summer, summer, and autumn wildflowers, so you can use plenty of sheets without getting bored. When not in use, they can be stored in the slim case.
The letter paper is made of firm, thick high-quality paper with a dot pattern on the reverse side. The size is just right for use as memo paper or for small letters.
Motifs: katakuris, nirinoso, amadokoro, fireflower, screw-tree, gibboushi, wild grapevine, and flower petals, etc.
Size: Mini letter paper: 9cm x 9cm, case: 10cm x 10cm
Material: Paper
Contents:24 sheets per case