beta
I think that mikaela is angel it must be 1st angel!! To the think yuu is 2nd angel
With his name, it would make sense. Michael is usually considered the first angel, strongest angel, or angel closest to god.
honestly, who exactly yuichiro? Whether in what chapter, Yuu said that he was considered a monster by his parents before becoming the seraph of the end experiment material, in other words from born yuuichiro not human or already have demonic powers.