The two were both 4th generation members of Morning Musume and were a part of sub-unit Minimoni as well. They also formed a duo called "W" together.

With a two-shot photo of her and Tsuji holding microphones, she wrote, "We sang and danced to the songs from our 'W' and 'Musume' times for the first time in 10 years!! Though we didn't even practice for it, we were still us!! We aren't twins, but it was as if we were."

She continued, "I will continue to be her partner forever, and for me too, Non (Tsuji) is my precious friend. I want to keep growing old together with her!"

Kago ended the blog post with a photo of her kissing Tsuji saying, "Of course, Aibon loves Non too (*^^*)!!!"

Source & Image(s): Oricon + Kago Ai Blog