Yuri na Watashi to Akuma na Kanojo (?) - Vol. 2 Ch. 10 - When He Turned Into a Girl

[MangaDex]

 

[DDosGaming]

why she acts like that...
she is already weaker and shorter than men before, men also fawning over her back then. his testosterone also not functioning well. so there shouldn't be any big changes after transform.

it is more like mikoto is dead and some being with his memories replace him. new brain with all neuron connections reset to toddler's.

 

[couscous]

At no point in the previous chapters was it suggested that being a guy is what let Mikoto protect her