Gakuen no Ouji-sama ni Mesu Choukyou suru Koto o Shiirareteimasu! | Being Coerced Into Training The Prince of The School How To Be a Woman {Doujins.com}
A manga about Shirou Emiya who went to save Rin Tohsaka from captivity and is transformed into a female slave through physical feminization and brainwashing[Fate/ stay night)