Kishiryu Sentai Ryusoulger

A Micro Offense and Defense (1x28)

:

Kleon manages to sneak a microscopic Minosaur into Asuna's body, forcing Koh to shrink down in order to save her. However, his efforts are complicated when he finds that the monster's tail is tied around Asuna's heart, meaning he can't kill it without killing her at the same time!