That Girl is Majoroshi

Momo liked ribbons, pink, and cute things that looked good on a slender girl's body. His best friend, Yukino, with whom he could share his cuteness with peace of mind, was his only source of support, but that relationship also fell apart. Momo was on the edge of despair when a voice whispered in his ears, "Shall I make your wish come true? If you want to fight in this world, I'll make you a girl.'' (Source: Kondasha, translated) *Note: Includes 13 extra chapters.*