Upon hearing news that his mother was on verge of death, Haru Kaidou—the eldest son of the family—flies all the way to Canada. The moment he arrives, he learns that not only did his mother fool him, but he is also supposed to take care of his adoptive brother, Ren Kaidou, an antisocial kid who feels more comfortable around dogs than people.
Due to his new brother's distrustful nature, Haru initially has a hard time reaching out to Ren but their relationship eventually grows. He makes a promise to Ren: they will live together in Japan after Haru graduates from high school. However, due to an unfortunate accident, Haru loses all memories of the summer they spent together, including the promise he made. Five years later, expecting Haru to keep his promise, Ren arrives in Tokyo; but to Haru, Ren is just a random boy claiming to be his brother.
[Written by MAL Rewrite]+ More
Characters & Voice Actors

Asakura, Ayumi
Supporting
Dieckmann, Haruko Daniela
Supporting
Kaidou, Aki
Supporting
Kaidou, Shima
Supporting
Kashiwagi, Mikiko
Supporting
Kondou, Kiri
Supporting
Kurosaki, Juuzen
Supporting
Sasaki, Ikuyoshi
SupportingRecommended for you
Hozuki's Coolheadedness
TV
24m
BanG Dream! Garupa☆Pico
TV
3m
Bleach
TV
24m
Detective Conan: Zero the Enforcer
Movie
110m
Gekkan Shoujo Nozaki-kun Specials
Special
3m
Digimon: Digital Monsters
TV
24m
Barefoot Gen
Movie
83m
Haikyuu!!: Riku vs. Kuu
OVA
22m
Hidamari Sketch x SP
Special
24m
Lupin III: Part II
TV
25m
Teasing Master Takagi-san
TV
23m
Lupin III vs. Detective Conan
Special
105m
Mind Game
Movie
103m