"Koi Shiyō"(恋しよう) is the second single by J-pop singer Leah Dizon. It was released on May 30, 2007. The regular edition includes a bonus sixfold mini-poster, while the Limited Edition includes a bonus DVD which contains a music video, and making-of footage. To promote the single, the song "Could you be that one?" was featured in the Tecmo commercial for Ninja Gaiden Sigma.