Guardian Heart, Mobile Ultraman

The story takes place when the protagonists are in college. Due to the age gap, they are in different grades. In the school, some classmates are laughing and talking, while underground, there is a huge laboratory, which also serves as an alien trajectory research center, where these three mechas are stored. The blood types and potentials in the body of the three protagonists are exactly in line with the three mechas, and they accidentally gained the ability to transform into the mecha Ultraman. Note: The opponents that the protagonist team has to fight are very powerful, so they will often be defeated. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.