From: Manga Planet

Rina Shiina's life was suddenly ripped apart and, as a result, has to repeat a year, making her infamous among her classmates. Always alone, Shiina finds refuge at the emergency stairs where she shares her lunch with an injured kitten. Coincidentally, a stereotypically old-fashioned nerdy looking girl with thick glasses comes to care for the injured stray, only to run away after seeing Shiina there. Inviting her to share the space, Shiina and Glasses Girl -Kurumi Kamiya- become more and more comfortable in each others' companies. One day, the kitten suddenly disappears. Devastated, neither Kamiya nor her glasses can hold back her tears, and after her transformation in front of Shiina, her kitten is not the only thing she loses.