The 19-year-old pugilist, who was making her maiden appearance in the World Championships, lost the gold medal bout 1-4 against second-seeded Ekaterina Paltceva of Russia.
Manju has assured herself of at least a silver medal as she dominated her bout against her Thai opponent and registered a 4-1 win in the semi-final stage of the competition.
She will next face Algerian fifth seed and defending champion Ouidad Sfouh in the pre-quarterfinals in what will be a tricky bout for her.
