A Whole Youth Spent Loving You

She suddenly barged into his world, seeming like both a light and a salvation. "Little one, will you marry me when you grow up?" "W-Who said I'd marry you?!" Though she was so embarrassed her ears turned red, she stubbornly denied it. The boy smiled to himself, thinking how cute she was... "Why did you leave without a word? You were gone for five years!" One day, five years later, she pinned him against the wall and demanded furiously. "It's okay. I won't leave again." "Stay by my side. I don't know how long I can keep you here, but as long as you're with me, that's enough..." [Feel-good power fantasy] + [Secret identity] + [Strong male and female leads] No amnesia plot, no misunderstandings