It's been a while since we saw a developer diary for Mind Zero, which hit PS Vita and Europe back in May. It was right around release that we saw dev diary #3, but Aksys Games saw fit to bust out another one earlier today.
Mind Zero developer diary #4 has producer Takayuki Harakami and director Keiichi Kawakami elaborating on the characters protagonist Kei has to rely on while exploring the perilous Inner Realm.
Aksys describes the story:
Precarious situations quickly befall Kei and his group of friends as they soon find themselves inexplicably whisked away to a mysterious weapon shop. There they meet an undertaker whose payment for strange, otherworldly weapons may require more than they’re willing to offer! As they progressively delve further into the Inner Realm, a spiritual plane that is connected to our Outer Realm, it becomes apparent that the two worlds are more than just connected: the events of one affect the other!