Manga by author Minamori Koyomi

Katakura Tsumuri is the school nurse who runs the high school's infirmary... which is good, because she's the one who needs to make use of it the most. Tsumuri has a weak constitution, and constantly tires herself out or faints from doing her day-to-day job. It doesn't help that she's also a space cadet and lazy at heart, so when she's not asleep in the infirmary's bed, she's got it covered in snacks and games. Her younger brother, Kouta, is a student at the school and spends plenty of his free time assisting his sister and unwillingly rescuing her from the demands of adulthood.

From Shoujo Crusade:10-year old Niina is special. This is because she has the memories of her past life as a girl named Chitose still intact. Among these memories is a promise with Chitose's boyfriend which Niina then decides to try and fulfill. But can she really?Includes the following one-shots:Koi Baka. (volume 1)Toda is a really smart girl but has no passion for anything. She admires idiots who are passionate, especially her classmate, Iijima.*Note: The series is not fully scanlated. The main story is done, but the two side stories are NOT scanlated in volume 4.