Thanks for writing about Manga. In my opinion Jp animations are very famous. There are some nuance mistakes:

Are you interested in Japanese "anime" ?

Do you know Japanese animation?
There are many animation ------(animations) in Japan, and
not only children but also adult----adults enjoy watching them.
My favorite animation is "Neon Genesis EVANGELION".
It is very famous in Japan, and last month I watched the latest movie.
It's about a story that ---- of a boy who are --- is the pilot of a weapon called EVA
fighting to ---- against the mystery ----- Mysterious (adj) object.
He works hard with his a ------ (a is not necessary here. ) companion, and grow up little by little.

The story is very complicated and have --- has so many mystery. ----- many mysteries 
However, If you watch it once, you will be fascinated by amazing  its story!

Thank you☆

【日本の"アニメ"に興味はありますか？】

日本のアニメーションをご存知ですか？
日本にはたくさんのアニメがあって、
子供だけでなく大人も楽しんでいます。
私のお気に入りは「新世紀エヴァンゲリオン」です。
日本では人気があって、私は先月最新映画を観てきました。
エヴァと呼ばれる兵器のパイロットである男の子が、
謎の生命体と戦うというお話です。
彼は仲間と一緒に戦い、少しずつ成長します。

話は複雑で、謎が多くあります。
でも、一度観たら素晴らしい世界観に魅了されることでしょう。

Please check my notebook!