SCANDAL's digital exclusive single Saishuheiki, Kimi (最終兵器、君).
The song is also included in SCANDAL's latest album Kiss from the darkness, available from JPU Records as a regular edition CD with bonus track and English lyric translations and Romaji transliterations, plus a limited edition CD with all that and an English print of magazine "her" volume 2.
Written by guitarist MAMI and with lyrics from drummer RINA.