Boss Bang is a bi-monthly event, alternating with
Double Penetration, that last for four days, where the main premise is that you have to defeat the Boss one hundred times using five set of team, each composed of six girls. Once you set your teams, it can no longer be changed. Each team has fixed ego that will go down after every battle and can only be refilled through synergy bonus.
When one of the team's Ego reaches zero, they will be considered as Tired, they will no longer be able to participate in the fight and will remain that way until the end of the event. But by spending 100/600 kobans, the Tired team can once again return to combat.
The Boss' level is the same as the player, and for every battle done, the Boss will gain one more level, making the battle challenging as it goes on. Though the player leveling up will not affect the Boss' level in any way.
There are five chests that can be obtained for every 20th win which consists of a mythic item and a 20x shard of the currently available girl, collecting all five of it will make the event girl join your harem.
