A Sister's All You Need., Vol. 13 (light novel)

Winter ends, spring arrives, and our protagonists take a new step forward. Haruto
announces a new series. Miyako joins Branch Hill Publishing to finally become a
professional editor. Chihiro becomes the life of her university’s TRPG club. Finally, a
100,000-character love letter inspires Itsuki to pour more energy into his novel and
become a genuine protagonist. A new everyday life dawns as the series enters the first
half of its final chapter!