
Overview:
When 16-year-old Nanako Misonoo enters the prestigious all-girls Seiran Academy, she believes a bright future awaits her. Instead, the unlucky girl finds herself dragged into a web of deceit, misery, and jealousy. On top of that, she is chosen as the newest inductee of the Sorority, an elite group whose members are the envy of the entire school. Having none of the grace, wealth, or talent of the other members, Nanako quickly draws the ire of her jealous classmates—especially the fierce Aya Misaki.
To cope with her increasingly difficult school life, Nanako recalls her days through letters to her former teacher, Takehiko Henmi, whom she affectionately calls "onii-sama" (big brother). She also finds comfort with her four closest friends: her childhood friend Tomoko Arikura, the sociable but erratic Mariko Shinobu, the troubled musician Rei Asaka, and the athletic tomboy Kaoru Orihara.
An impassioned drama about the hardships of bullying, Oniisama e... chronicles a young girl's harsh life at her new school, as she endures cruel rumours, heartless classmates, and countless social trials.
[Written by MAL Rewrite]
Characters and Voice Actors

Asaka, Rei
MainShimamoto, Sumi
Japanese

Ichinomiya, Fukiko
MainKoyama, Mami
Japanese

Misonoo, Nanako
MainKasahara, Hiroko
Japanese

Orihara, Kaoru
MainToda, Keiko
Japanese

Shinobu, Mariko
MainTamagawa, Sakiko
Japanese

Arikura, Tomoko
Supporting-
Japanese

English Teacher
SupportingKuwabara, Takeshi
Japanese

Henmi, Takehiko
SupportingGenda, Tesshou
Japanese

Ichinomiya, Takashi
SupportingHoriuchi, Kenyuu
Japanese

Japanese Teacher
SupportingShinohara, Daisaku
Japanese

Mathematics Teacher
SupportingInaba, Minoru
Japanese

Misaki, Aya
SupportingKatsuki, Masako
Japanese

Nanako's Mother
SupportingSuzuki, Hiroko
Japanese

Professor Misonoo
SupportingArimoto, Kinryuu
Japanese

Shinobu, Hisako
SupportingYoshida, Rihoko
Japanese

Tomoko's Mother
SupportingArima, Mizuka
Japanese
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