I was reading this manga because I wanted to know why this manga was cancelled. And now I know.
...looking at Nicole really makes me think that Reid was actually really weak. He never really trained his gifts and an embarassment for an assassin.
Using Stealth/Secrecy as much as possible is normal for an assassin, and he never thought of using it actual combat and only in assassination? Because if he did, he would have easily found out that using Stealth/Secrecy can make someone vanish temporarily even when in CQC.
His old use of Thread Manipulation was also too conventional. Binding things, hooking things, that's normal. He never thought of using lighter weapon combined with threads for medium range combat? And I'm not even sure what's the science behind wrapping your limbs with only so much threads could improve someone's strength so much.
As an ex-assassin that found that she actually still have his old gifts, how come she never truly trained them again until years later? She should have known the dark side of the world, Reid was famous as the best assassin in the world! Also, an assassin that never wear disguises and never contemplated of using poison? What a blasphemy!
And Maxwell also mentioned that Reid was also weak in magic. Add with how stupid as an assassin Nicole was since she left so many traces, I think maybe Reid was far weaker than the other five heroes?
And if everyone easily found out later that Nicole was Reid, I think making Reid reincarnated into a girl is a really stupid move by the author. What about Finia and Cortina's feelings? What would you think Lyell and Maria's reaction would be, knowing that Nicole actually have Reid's memories and personality, a perverted adult male?