Ultraman: Hikari’s Sister Is Just a Medic

During a war, Sylvie and her brother Hikari lost their parents. Father of Ultra and Mother of Ultra took them in.

As they grew up, both siblings displayed exceptional talent. Hikari's research into solidifying life forms drew the attention of the Yapool. To obtain the technology, the Yapool joined forces with Bogaru to kidnap his younger sister, Sylvie, and steal it.

At the same time, in an effort to wipe out the entire Ultra race, a research unit formed by the Yapool and the Yapool's allies, the Yapool, subjected Sylvie to a series of experiments and used the life-solidification technology to modify monsters.

The Ultra Brothers rushed to the rescue, but were defeated by Sylvie after she was controlled and modified. At the critical moment, Hikari arrived and brought his sister back to her senses.

To completely destroy these dangerous modified monsters, Sylvie detonated the bomb the Yapool had left on her, blowing up the entire base. Her own body was also completely obliterated...