Please support the artist if you can! https://ec.toranoana.jp/joshi_r/ec/cot/circle/2UPA116Q8X7KdD6Pd687/all/
This is a collection of short stories and art the artist contributed to two TanRen anthologies (すきときめきときす/Suki Tokimeki to Kiss & 不帰の恋/Fuki no Koi) plus some other related content by the same artist. Unfortunately we don't seem to have scans of either book.