Prepare Yudane Dough: Combine 60g of high protein bread flour with 55g of boiling water, stir well until mixed. Cover and refrigerate overnight or cool for 4 hours.

Dough Prep: Bring Yudane to room temperature. In a mixing bowl, combine remaining dough ingredients, knead for 4 minutes.

Incorporate Butter: Add softened butter, knead for an additional minute until fully integrated.

First Proofing: Shape dough into a ball, cover, and proof in a warm place until it doubles in size (45-60 minutes).

Shape Loaf: Deflate dough, divide into two pieces, shape into ovals, rest for 10 minutes, then roll into cylinders.

Second Proofing: Place shaped dough in loaf pan, cover, and rise until it reaches 80% of the pan height (about 40 minutes).

Preheat Oven: Preheat oven to 190°C (374°F) during the last 15 minutes of second proofing.

Bake: Bake for 25-30 minutes until golden brown. Cool on a wire rack before slicing.