A 14-year-old boy who stabbed to death a fellow student at a junior high school in central Japan on Wednesday said he had troubles with the victim and held a grudge against him, according to investigative sources.The alleged attacker, whose name has been withheld as he is a minor, also told investigators he bought a 20-centimeter-long kitchen knife online in advance, the sources said Thursday. He is believed to have used it to stab Yuzuki Ito, also 14, in the stomach.The attack took place at Jushiyama junior high school in Yatomi, Aichi Prefecture, at around 8 a.m. Wednesday. Ito died due t…READ FULL ARTICLE