Leading up to the Degenki Bunko Fighting Climax debut, Dengeki Online announced two more characters for the crossover fighting game. Misaka Mikoto, the protagonist in A Certain Scientific Railgun, and Kirino Kosaka from My Little Sister Can’t Be This Cute will be playable characters in Dengeki Bunko Fighting Climax. Shana from Shakugan no Shana and Asuna from Sword Art Online were confirmed when the arcade game was announced.

Touma Kamijou (A Certain Magical Index), Leafa (Sword Art Online), Kuroneko (My Little Sister), and Wilhelmina (Shana) are support characters.

Degneki Bunko Fighting Climax has a four button battle system – A (weak), B (medium), C (strong), and S (support). After you use a support character there is cooldown time before you an use them again and the time is usually a few seconds, but varies depending on the character. Movement-wise, you can dash, back dash, and double jump.

A+B does an Impact Skill (down A+B is a special attack), B+C is your Trump Card a powerful attack that uses one Dengeki mark. You start a match with two Dengeki marks and only recover one per round, never getting more than two. Trump Card attacks have some invincibility frames when you start the attack and deal heavy damage. Blast is triggered by pressing A+B+C and uses the "Blast On" icon. Blast has different effects like it can stop a combo if you’re being attacked, but if you’re in a regular state it strengthens your fighter.

Each character has an "awakening" type ability called Potential. When specific conditions are met such as when your life is low your attack power will go up. Effects and triggers for Potential differ depending on the character. Extend Action changes both regular attacks and special attacks when you hold down a button after inputting a command. The Climax Gauge (probably the bar with a 0) is essentially a super meter. The bar gains meter when you attack, block, and automatically fills if you do nothing. You can stock up to five meters. EX Special Moves are essentially EX Specials from Street Fighter. If you press the S button while doing a special attack you can do a more powerful version of the move, but costs one Climax bar. Climax Arts are super moves that take two bars. Reflection Guard pushes back an opponent while blocking, but consumes some meter.

Dengeki Bunko Fighting Climax also has a canned combo if you mash A that goes from A (weak) –> B (medium) –> C (strong) –> impact attack –> EX Special (if you have meter).