In a special episode of D4DJ Double Mix, the spotlight shines on the groups Merm4id and RONDO. The legendary DJ festival 'D4 FES.' makes a comeback, granting Merm4id's dream of participation. As Marika Mizushima, Saori Hidaka, and Dalia Matsuyama observe Rika Seto's strange behavior during a swimsuit photo shoot, tensions rise. Simultaneously, Tsubaki Aoyagi from RONDO reflects on her aspirations in a chapel, envisioning a future of expanded horizons. Following a live concert at the ALTER-EGO clubhouse, Rika surprises Tsubaki, Nagisa Tsukimiyama, Hiiro Yano, and Aoi Miyake with an unexpected proposal, showcasing her determination to embrace life with luck and charm.