Takahiro Aoyagi worked as a teacher for a company that operates cram schools
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The editorial team at The Tokyo Reporter brings the site's readership the latest news from the under side of Japan.
Suspect said, 'We got into a quarrel about his frequent drinking'
Aoi Hori, 20, is alleged to have used a knife to fatally stab Miku Yamada, 19, on Sunday
Photograph posted on Twitter showed the front glass of the train was shattered
Suspect denies the allegations, police said
During the attack, the suspect jumped atop the victim, an eyewitness said
Suspect told police that he does 'not recall' the matter
Suspect admitted to the allegations, police said
Case is being treated as the result of foul play or an accident
Police also found a glass pipe for smoking marijuana