Suspect told police, 'Because she was my type, I followed her'
Defendant said that she did not know that the containers contained stimulant drugs
Footprints made by bare feet were also found nearby, a local office said
In referring to the knife used in the crime, Yuka Takaoka told police, 'It was the one thing I put in order in preparing for a new life with him'
Taki told the court, 'I used cocaine for stress relief'
Matter emerged after the girl and her mother consulted with police
Woman was found collapsed on her side and bleeding from her mouth atop a bed, police said
Suspect 'did not know whom to consult' about the matter, police said
Suspect denies the allegations, telling police he has 'no memory' of the incident
Wife remains in serious condition, police said