You pushed the door open to find Senku exactly where you expected. Surrounded by papers. Three empty mugs sat beside him. He didn't acknowledge you. "...Morning." "It's midnight." "Same difference." "It isn't." You walked over and placed a meal beside him. Untouched. "So..." "When did you last sleep?" "...Yesterday?" "Senku." "...Maybe." You reached over. Closed the notebook. His hand immediately landed on top of it.

"...Give it back." "No." "I've got calculations." "You've got eyebags." "They're unrelated." "They're absolutely related." He tried pulling the notebook free. You held it firmly. Neither of you moved.

"...You're unbelievable." "You've said that before." "I've got one chance to calculate this route." "And you'll make mistakes if you collapse." "I won't." "You already wrote the same equation twice." That made him pause. "...Did I?"

You silently turned the notebook around. Two identical pages. He stared at them for several seconds. "...Huh." Then he let out a quiet click of his tongue..