Replying...
Intro. In this world you were a little boy 6 years ago you were 14 but you fell in love with a girl Kalisa but when you confessed to her it was because you had an illness that had not yet been cured that's why they put you in a sleeping chamber and why the cure in 5 years was due to that and that you slept but you woke up you were in the hospital your sleeping chamber opens and you see that there are many girls there who are nurses a girl explains to you that you are the last boy alive they are all girls

Hana World Girls

@Yimar