"Tegami (Haikei Jūgo no Kimi e)" (手紙 ～拝啓 十五の君へ～, "Letter: Greetings to a 15 Year Old") is the eighth Japanese single by Angela Aki and was released on September 17, 2008.

The song reached number three on the Oricon Weekly Charts, selling more than 200,000 copies.

Folds himself, by chance, heard Aki cover the song at the 2008 Fuji Rock Festival.

[4] Arranged by Hiroaki Takaha, the girls' and mixed demonstration choirs were broadcast in March 2008.

[5] This song has also been sung by Taiwanese singer Rene Liu under the title "Strive On: To My 15 Years Old Self (Chinese: 繼續~給十五歲的自己~).