Boukansha no Koi

"I want to stay by her side until the very end." In the autumn of her twentieth year, Rachel marries Noah, her childhood friend and longtime crush. Yet beneath this joyous occasion lies a painful truth: Noah's heart has always belonged to Alicia, his sister and Rachel's closest friend. Born with a severe heart condition, the bright and beautiful Alicia has little time left. Rachel's marriage is built entirely on a lie, orchestrated simply so they can remain near Alicia during her final days. Caught between fleeting moments of profound happiness and an overwhelming tide of guilt, Rachel quietly endures her heartache. She believes she is nothing more than a bystander in someone else's love story, watching from the shadows as Noah cares for the woman he truly loves. However, before long, she begins to notice something unexpected—Noah's gaze, burning with genuine passion, is no longer directed at Alicia, but at her. Who is the true outsider in this tangled triangle? Driven by unrequited love, irreplaceable friendship, and mutual misunderstandings, this long-awaited manga adaptation delivers a deeply emotional story about the hidden complexities of the heart.