In an alternate future where technology allows people to receive anonymous letters written by someone from a parallel timeline, Nobita-now a high schooler-starts getting encouraging letters from someone who clearly knows him too well. As he struggles with confidence and finding purpose, the mysterious letter-writer becomes his secret source of strength. What he doesn't know is that the letters are from a different timeline where Dekisugi had confessed his love... and lost him. Now, the Dekisugi of this world starts noticing Nobita's growth and charm-and begins falling in love without realizing he's unknowingly competing with... himself.
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