Mitsugu Bamba is a high school girl who adores contributing her blood, to the point that she really feels forced to check out a neighborhood blood bank regardless of the unfriendly nurse. Someday, Mitsugu comes across a beautiful girl there that looks like she has actually originated from abroad. The lady is so light that she shows up ready to pale. Rather, she instantly starts trashing the blood bank. The lady then passes out and so Mitsugu takes her house ...