きゃりーぱみゅぱみゅ
From 4 June 2016, set 9101 operated in a special "Seibu KPP Train" pink livery to mark the 100th anniversary of Seibu Railway in 2015 and the fifth anniversary of singer Kyary Pamyu Pamyu. The train operated in this livery until 29 September 2016, after which date the Kyary Pamyu Pamyu vinyls were removed, with the trainset operating in all-over pink livery.