Otonari ni Ginga

After his father's death, Ichirou Kuga becomes responsible for raising his two younger siblings and supports them by drawing shoujo manga. Deadlines and the loss of his assistants push him close to collapse until Shiori Goshiki, a remarkably talented new helper, arrives and saves his work. She then reveals something much harder to believe: her family comes from an island tied to an otherworldly lineage, and an accidental touch between them has created a real engagement pact.

From then on, working together is no longer only about pages and drawings. The pact keeps them physically close, but the feelings developing between them need no supernatural force to become complicated, especially with Ichirou's family responsibilities and Shiori's very different world pulling at them both.