Watch on Soap2day. AKB48 Group Rinji Soukai "Shirokuro tsukeyou janai ka!", also known as AKB Fair at Nippon Budoukan, is AKB48's spring concert, including its sister groups SKE48, NMB48 and HKT48. The 3rd group to perform is HKT48. This is their first concert held at the Nippon Budoukan.