 If you liked
Tetsuwan Birdy
|
 ...then you might like
Igyoujin Oniwakamaru
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In both manga, the main protagonist is forced to share their own body with another spirit inside them to keep them alive. The main protagonist in both manga must work together with their super powered alter ego to transform into a powerful humanoid being to fight evil monsters for the sake of survival. Both manga are quite action-packed as well. If you like one, you may enjoy the other.
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Recommended by Hellspawn28