Police arrested over the weekend a man who allegedly assaulted his girlfriend's 4-year-old daughter just a day before she drowned in southwestern Japan.The 21-year-old man, Shun Hiwatashi, a construction worker and live-in boyfriend of the girl's mother, was arrested Saturday for allegedly hitting the girl, Riara Otsuka, in the head at their Kagoshima Prefecture home last Tuesday.Before the incident and her death, police had requested multiple times that the child be taken into protective custody by local welfare authorities, but they failed to follow the instruction, according to the polic…READ FULL ARTICLE