Erica, an S-rank mercenary with overwhelming skills. Following her around everywhere is another S-rank mercenary, Chawood. "Erica, let's be permanent partners. Pair up with me, and only do it with me." "Why do you want to partner with me so badly?" "Because it pisses me off." "......?" "Just thinking about you hanging out with some other pathetic guy instead of me makes me so pissed I can't even sleep." Same age. S-rank mercenaries. Their ruined personalities were even similar. She must have felt a subtle sense of camaraderie, given how fast they became close. "Erica. There's something I really want to have, but I'm going crazy because I can't have it. If someone else takes it from me, it's war, seriously. "I don't know what it is, but why are you glaring at me while saying that? Did I steal it?" "Every time you do that, I want to cry." As time passed, Erica couldn't help but be flustered. "W-What on earth is wrong with you?" "I told you, Erica." He murmured in a low voice. "If someone else takes it, it's war."