Is This a Popular Method of Decomposing a Body?

Junco, a 19-year-old Japanese woman was tortured for 44 days by four boys. The men decided to dispose of her body in barrels filled with wet concrete. They used this method because they didn't know the cement company and it wasn't going to be used soon. Junco says she is angry about what happened but doesn't want people to think she's a serial killer.