Battle Heart 2026 ~ Day 1 was a professional wrestling event promoted by Dream Star★Fighting Marigold. It took place on October 3, 2026 at 176BOX in Osaka, Japan, and served as the opening show of the tour. In the main event, tWin toWer (Chika Goto and Kouki Amarei) defended the Twin Star Championship against the team of Diana Strong and Mila Smidt.