Tsukuyomi and the Young Man

With Tiamat on the loose than Bethel on a warpath the protagonist is needed more than ever to save Japan, but after losing Aogami, it's impossible for him to transform into a Nahobino. However, Koshimizu offers an alternative; while they lack any combat type Proto-fiends, there is a logistic type that is close enough for him to gain the power of a Nahobino once again. While not as powerful, it it strong enough to give them the edge they need in the battles to come. In fact, it's Koshimizu himself, the god Tsukuyomi is human disguise, who will lend him his power.

Example of:
Emergency Transformation