More sincerity?? The girl is literally open firing her love at her though??
nah you need a letter reviewed and approved by an official of the love department in cupid office to make sure the message come across.
Some people are dense but we are talking about manga prota here, nothing but a bulletproof love confession would work.
ALSO, beware of any incoming train or firework show, please do it with just the 2 of you and nobody else in the vicinity, movie theatre or other show are ill advised.
If the confession is successful, congratulation, do not forget to wear protection during hand holding
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