Pajama no Kimi to, Kyoushitsu de Seishun wo

"We’re destined to be together"
The girl who smiled at me as she said that was wearing a strange uniform that looked like a combination of pajamas and a school uniform.
At school, you wear a school uniform. With such "normality" not being permitted, it is the girls who have vanished from the school that gather in the classroom of the high school’s Zero Year.
For some reason, I have a peculiar trait that allows me to recognize them. By helping Fuuka Kotomori, a beautiful, noble young lady-like Zero-Year student who is returning from the hospital and has no one to rely on but me, solve the strange phenomenon of disappearing from school, I grow closer to her.
What’s more, other beautiful girls in strange uniforms, each carrying their own troubles, have also gathered in that classroom...
In summer Kyoto, a story of youth unfolds alongside heroines who have disappeared from the world, as they journey toward happiness.