Honkai Impact 3Rd: Ice Herrscher

Ice in a sea of suffering, a young man like a dream, amid the ice and the fall of the Honkai. The ice is blue and pink, yet it cannot win her heart back. The girl has gone, leaving only blue, imprinted on the young man. Blue is loneliness, and hope in his heart. Ice that listens to the wind, ice that dyes the sky. Love in his heart turned pink, yet he could not get close to the girl's true colors. It began with ice, but something beyond his imagination held him back. What pierced his heart was not the ice, but his promise to the girl. (Previous Era timeline + Elysia as the sole female lead. The synopsis is lacking, so please head to the main text.)