Morita-san wa Mukuchi (2011)
Original title: 森田さんは無口
Morita-san wa Mukuchi is a 2011 Japanese-language animation series. It stars Kana Hanazawa, Ami Nanase and Masatoshi Kī.
Mayu Morita is a high school girl who rarely speaks, not because she doesn't like to talk nor because she has nothing to say, but because she thinks too much before speaking, thus losing altogether the timing to speak.
Where to watch Morita-san wa Mukuchi
Stream: Crunchyroll, Crunchyroll Amazon Channel