Re:ZERO -Starting Life in Another World-, Chapter 3: Truth of Zero, Vol. 7 (manga) — Tappei Nagatsuki

Wilhelm, the Sword Devil, has been swallowed whole by the demon beast known as the White Whale. What's more, the White Whale has split into three bodies! Amid this desperate fight, Subaru arrives at the truth. To break through the deadlock, he tries to reverse the tide of battle. Here and now, the man who lived for both love and the sword seeks to end his own 400 years of darkness!