がんばれ！小傘ちゃん
Artist: yuzuna99

Slice of life 4koma series about Tatara Kogasa.

Not to be confused by Mizuki Hitoshi's series (がんばれ小傘さん, pool #2420), which is a diary series with the artist as Kogasa.
Neither to be confused with sk-ii's doujin series with a similar name. (がんばれ!(泣)こがさちゃん!!, pool #1314 and pool #4464)

See also

• Pixpedia article: http://dic.pixiv.net/a/がんばれ!小傘ちゃん
• Nicopedia article: http://dic.nicovideo.jp/id/4371929