If you're looking for manga similar to Yuru Yuri: Mini Yuri, you might like these titles.
Proud honor student Soyoko Okita 16-year-old meets a mysterious beautiful girl, Fukaina Nemu, one day. Soyoko tries to find a secret of sleep that has better grades than herself! But she always sleeps soundly!?
Hazumu is a shy and quiet boy who loves flowers and is forced to rely on his tomboy childhood friend Tomari as a bodyguard. Yasuna is the prettiest girl in school but she avoids men like the plague… until she meets Hazumu. Encouraged, he confesses his love; heartbroken, he heads for the mountains to be with his flowers. As if Hazumu’s troubles aren’t enough, his day is further ruined when an alien ship accidentally kills him. Luckily, alien technology exists that can revive him, but not without a price: Hazumu returns from the dead, but in the form of… a cute girl?!