I'll tell you this before you read it... Don't expect anything from the romantic subplot.
The mc's gf used to be a partying whore and this relationship was strongly opposed by MC's little sister because she knows this.
The plot is flawed emotionally. The MC actually loved a good girl at first. But he barely remembers her these days even though it's his negligence that caused her death.
The story would've been great had it not been the leftover of a leech girlfriend and the d*ckheaded MC...