"Some promises survive time... even when memories don't." When sixteen-year-old Miku Hatsune transfers to Hatsune Academy after losing years of her childhood memories, all she wants is a fresh start. But fate has other plans. A chance encounter with the talented and charming Len Kagamine sparks an unexpected connection through music, drawing them closer with every shared melody. As forgotten feelings begin to resurface, Miku discovers that the bond between them is far older-and far deeper-than either of them imagined. Just as their love begins to blossom, mysterious figures from Miku's forgotten past appear. Secrets long buried, broken promises, and hidden truths surrounding their families threaten to unravel everything they thought they knew. Can love overcome memories that were stolen by time? Or will the past tear apart a promise that was meant to last forever? In a story filled with music, romance, friendship, mystery, and the bittersweet beauty of remembering, some hearts never truly forget the people they were always meant to cherish.

Len, student in Crypton High School, never found anything called "love" but then he met Miku Hatsune, a new transfer student. Will she be The One?

Foreign Exchange Students Lumine and Aether have been at Teyvat University for a few months now, and after adjusting to their school lives, they decide to begin building their social lives! what interesting people shall they meet at their time here? crack story with some plot AU explained in the Explanation chapter