If this is your first time playing the Kancolle RPG, the first thing you will want to do is look through the "Shipgirl Directory," choose one whom you would like to play as, and print out or copy her information.
Kancolle (艦これ) is an apocryphal fan-translation of the commercially-published Japanese-language game Kantai Collection (艦隊これくしょん).
In this peculiar game, characters are "Shipgirls" - anthropomorphized/transforming naval warships. Characters are assembled into task groups and sail against opposing task groups.
The translation appears primarily to be adapted from Kancolle, with various refinements. The art utilized appears to be copyright-infringing material. The item also bundles some print-and-play materials including a character sheet and an action tracker.