Natsumi Hikari (Novel)

The novel Kamen Rider Decade: The World of Tsukasa Kadoya ~The Garden Inside the Lens~ also featured another Natsumi Hikari (光 夏海, Hikari Natsumi) who is a resident for World of Decade.

History
Though not much to be known, but this Natsumi is a civilian whom suffering worldly troubles, leading her to suicide.

Tsukasa and the original Natsumi whom returns to the World of Decade read an article about the poor woman's tragedy, which they had stumbled on.