★ 7.3 Movie
A Letter to Momo
Kouichi Uehara is a fourth grade student living in the suburb of Tokyo. One day, he picks up a large stone which turns out to be a fossil of a baby "Kappa" sleeping underground for the past 300… Read more
Storyline
Kouichi Uehara is a fourth grade student living in the suburb of Tokyo. One day, he picks up a large stone which turns out to be a fossil of a baby "Kappa" sleeping underground for the past 300 years, and names it "Coo". Koichi and Coo become good friends and starts living with his family. However, Coo could not adjust to the life style in Tokyo and starts to miss his family. On a hot summer day, Koichi and Coo decide to go on an adventurous road trip to find his peers. (Source: AniDB)
Characters & Japanese Voice Cast
Coo
Main
VA: Kazato Tomizawa
Kouichi Uehara
Main
VA: Takahiro Yokokawa
Ossan
Supporting
VA: Yoshito Yasuhara
Yukari Uehara
Supporting
VA: Naomi Nishida
Hitomi Uehara
Supporting
VA: Tamaki Matsumoto
Yasuo Uehara
Supporting
VA: Naoki Tanaka
Sayoko Kikuchi
Supporting
VA: Natsuki Uematsu
Kijimuna
Supporting
VA: Toshiyuki Teruya
Nanushi
Supporting
VA: Yuzuru Fujimoto
Samurai
Supporting
VA: Michio Hazama
Ayana no Haha
Supporting
VA: Yuuko Nagashima
Coo's Father
Supporting
VA: Kenichi NagiraSimilar Anime
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Frequently Asked Questions
How many episodes does Summer Days with Coo have?
Summer Days with Coo has 1 episodes.
Which studio made Summer Days with Coo?
Summer Days with Coo is produced by Shin-Ei Animation.
Facts from AniList (also listed on MyAnimeList); streaming availability from JustWatch India. Last updated 18 October 2026, 5:43 AM IST. Episode times are Japan broadcast times shown in IST. Spotted a mistake? Write to [email protected].