Police in Ichikawa, Chiba Prefecture, have arrested a 36-year-old man on suspicion of killing a 21-year-old university student. According to police, Yoichiro Saito, a transport company worker, fatally stabbed Kensuke Iwamoto multiple times in the back at around 11 p.m. on May 10 at the victim’s apartment in Ichikawa, Sankei…