ナゾトキ (Nazotoki)

Nazotoki (ナゾトキ / Solving Riddles) is a song composed by Hinata Haruhana, illustrated by Abe, and sung by Kagamine Len. The song is a part of Hinata Haruhana's mini series; based on her original story.

It's one of Hinata Haruhana's most notable hit, which reached Nico Hall of Fame (exceeding over 100,000 views)
 * Nicovideo broadcast
 * Youtube broadcast

Background
The song was originally sung by Hinata Haruhana; first uploaded on February 19th 2010; later on a Len version was uploaded on March. It's answer song, Nazokake was uploaded a month after Len's version was uploaded, along with Hinata Haruhana's version of it.

The song was based on Hinata Haruhana's story Umi ha sono nazotoki wo nozomu noka?, however, the "full" version of Nazotoki uploaded on June hinted it was a "different" version, similar, but not the same.

The song was one of Len Append Power version demo; along with a rearrangement.