それはとてもうれしいです！

Japanese characters have three types

- Kanji 漢字

- Hiragana ひらがな

- Katakana カタカナ

the curvy characters that you said are maybe Hiragana. Hiragana is the most basic characters in Japanese.

https://en.wikipedia.org/wiki/Hiragana

わたしも、ひらがなはかわいくて好きです☺️💜