Kunoichi, is a Japanese word for women ninja. It's a combination of the hiragana "ku," the katakana, "no," and the kanji for "one," "ichi." The three strokes make up the kanji for "woman" and the word has been handed down as a word that indicates female ninja.
The T-shirt design by Masakazu Ishiguro is based on the Kunoichi idea. Nin-Shojo features an original black and white ninja-girl design on the front, and a redesign of the same illustration, grayed out, on the back so as to make the design inconspicuous. The back design was deliberate to incorporate the idea of the illusiveness of ninja.
The shirt from unit of land comes only in black and features five sizes, XS, S, M, L, and XL. It sells for 3570 yen (about $50 at current rates). Preorders are being accepted now, and the shirts are scheduled to be shipped in early September. A percentage of the proceeds will be donated to help victims of the Great Tohoku Earthquake.
Masakazu Ishiguro is best known in English-speaking countries as the creator of Sore demo Machi wa Mawatteiru (aka Sore-Machi, And Yet the Town Moves) which is published in English by J-Manga and the anime distributed by Sentai Filmworks.
Do you want ninja girls on your shirt?