Sombr to Perform at Summer Sonic 2025! This rising star singer-songwriter, currently gaining explosive popularity in Japan, is set to release a special Japan-exclusive 8cm CD single featuring a double A-side of the smash-hit tracks "back to friends" and "undressed"! *To play this CD, an 8cm CD-compatible player or a dedicated adapter is required. Using a non-compatible player may result in equipment malfunction or disc damage.