Koi o Shichaimashita!

"Koi o Shichaimashita!" (恋をしちゃいました！) is the sixth single by Morning Musume subgroup Tanpopo. It was released on February 21, 2001, on the Zetima Records label. The single features the group's "second generation" line-up of Ai Kago, Rika Ishikawa, Kaori Iida and Mari Yaguchi. The first press edition contained a limited-edition trading card.

The songs from this single are featured on the compilation album All of Tanpopo. "Koi o Shichaimashita" is the second track on the disk, while "Baby Cry" is the eleventh track. The music video for the single is featured on Tanpopo Single V Clips 1.

Chart performance
The single peaked at #2 on the weekly Oricon charts, charting for nine weeks. It also made Oricon's year-end list of the 100 best-selling singles of 2001, ranking at #47.

A reported total of 238,880 copies were sold in the first week, and it is Tanpopo's best-selling single with 386,830 total copies sold.

Covers
"Koi o Shichaimashita!" was covered by fellow Hello! Project group S/mileage on the limited edition versions of their fifth single, "Koi ni Booing Boo!", released in April 2011.

Members at time of single

 * Kaori Iida
 * Mari Yaguchi
 * Ai Kago
 * Rika Ishikawa