Jellyfish

Miyashita Yuki doesn't get along with her classmates and feels isolated. One day, her classmate Shinohara Kyoko starts talking with her in front of the jellyfish exhibit at an aquarium, and they start kissing. From that point, they are gradually drawn to each other, but...
(Source: JFDB)
~~ Adapted from the short story "Jellyfish" (ジェリー・フィッシュ) by Hinakura Sarie (雛倉さりえ).