DMM’s browser and mobile game Touken Ranbu (刀剣乱舞) previously hinted about making four swords available for Kiwame (極) upgrade. After a long maintenance yesterday (1st August), the game finally revealed their identities – they are indeed the four Wakizashi.
Kunihiro Horikawa (堀川国広)
Honebami Toushirou (骨喰藤四郎)
Namazuo Toushirou (鯰尾藤四郎)
Nikkari Aoe (にっかり青江)
Different from tanto, these Wakizashi have to reach level 65 before they get Kiwame upgrade.