 If you liked
Hiiro no Isu
|
 ...then you might like
Yozora no Sumikko de,
|
It has a very similar art style and gives off an incredibly similar fuzzy feeling of nostalgia. They're both very wholesome in their own way as well. Hiiro no Isu is fantasy and Yozora no Sumikko de is slice of life but the atmosphere and feeling you get from reading them both are the same. That feeling of hopefulness as well.