Description:

The OL Tae Honda went swimming at the community pool, but her lack of exercise caused her to cramp up in the water, when she was saved by a tall, beautiful girl Mai Igarashi. Feeling attracted to her savior as she left the the pool, Tae saw Mai come out carrying an elementary school backpack… (Source: MU)

Alternative Titles:

気をつけなよ、お姉さん。, Kiwotsuke na yo, Onee-san., Big Girl and Small Girl (Serialization)