If you're looking for manga similar to Kasimashi ~Girl Meets Girl~: A Girl Falls in Love with a Girl, you might like these titles.
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?!
What are the challenges of visiting a boy who became a girl to get along with his senior?
Kazumi Shinjou, who is a delinquent, and Risa Takaoka, who is a model student, become unexpected friends.