At Tower Records in Tokyo’s Shibuya district earlier this month, fans flocked to a pop-up store set up for Filipino boy band SB19, buying exclusive merchandise including limited-edition CDs, T-shirts, stickers and phone straps. Due to overwhelming demand, the store ran for an additional five days. During the band’s tour in Japan, SB19 met fans in Yokohama and performed in Tokyo and Osaka during the Summer Sonic festival. Another Philippine act, the eight-member girl group BINI, made their debut...