What is "tasogare"

is a Japanese 'active dramatized novel' eroge developed by Leaf. It was released on 2001 and was later republished in 2003. The 2003 version contains renovated graphics. For the period from January 29 to February 11, 2001 Tasogare was the best-selling bishōjo game in Japan, even though it was only released on February 9. It remained a best-seller for several months afterward as well.