They're both 4 volumes but I bought Ameiro Paradox (called Candy Color Paradox in ENG) and Shiminame Tasogare recently. No regrets. I love them both.
I’m planning to buy ‘Seven Days’ by Venio Tachibana and Rihito Takarai. It only has one volume and I absolutely love it. Also ‘Hishakaishindo’ by Enjo is a very good manga with 2 vols, but this is yaoi so I wouldn’t buy it if you still live with your parents.
I do have a tag here on mangago with manga’s with mostly one volume so you can check that out if you’re interested. ^^
http://www.mangago.zone/people/tag/909794/Short/
So I want to buy some Mangas from a store but I want short ones with 1-2 volumes it would be nice if could recommend me some.