Dear Brother

Nanako has her first day at Seiran Academy. Rei helps her on the bus, and Nanako is instantly captivated by her charm. At school, Nanako meets Mariko, who immediately asks her to be her friend.

Mariko looks out for Nanako before class, and shoves Tomoko out of the way when she finds Nanako. Fukiko comes to Nanako's class and announces three Sorority candidates: Mariko, Kaoru, and Nanako.

An insulting note is posted about Nanako's candidacy for the Sorority on the school bulletin board, announcing to the entire school that Professor Misonoo is not really her father.

Despite missing the selection party, Nanako has her interview, and humiliates herself. Mariko and Nanako realize that anyone could have left the message for Nanako, but Mariko correctly suspects Aya.

Nanako sees Kaoru stops Rei from taking some pills. Fukiko invites Rei into the Sorority House to help out with work, but intentionally injures her hand. Rei demands that Fukiko bandage her bloodied hand, but Fukiko refuses.

The bullying continues: Nanako's gym uniform is stolen and cut to shreds, and Tomoko won't lend Nanako hers.

Depressed from her classmates' bullying, Nanako goes to the school's clock tower to spend some time alone. There, she sees Rei, smoking and throwing knives at a carving of Fukiko in the wall.

Mariko tries to warn Tomoko off Nanako again, but Kaoru comes by and stops her. Fukiko invites Aya to the Sorority House and threatens her to stop bullying Nanako.

Kaoru collapses from chest pains, so Nanako tries to fetch painkillers from Rei. Rei doesn't take the situation seriously, so Nanako slaps her.

Mariko refuses to eat anything until Nanako forgives her, but Nanako is giving her the silent treatment. Kaoru notices Mariko's hunger strike and confronts her about it, angry that anyone would throw their health away when Kaoru herself is so ill.

The Sorority members have a special study session at Fukiko's house. Fukiko invites Rei to join them, telling her to wait under the elm tree at five o'clock, but doesn't arrive.

Nanako calls Kaoru to help take care of Rei. Kaoru arrives at Rei's apartment and slaps and yells at her for her masochistic devotion to Fukiko.

Rei is well enough to go back to school. She confronts Fukiko, but is made docile with a few words. Tormented, she retreats to the clock tower and takes too much drugs.

Nanako desperately tries to escape from Rei, but fails. Rei attempts to stab Nanako several times before regaining her senses and breaking down in tears when she realizes what she is doing.

A Sorority member named Junko Nakaya fails one of her exams due to having been seriously ill, so Fukiko orders her to resign.

It is Kaoru's first basketball game since her illness, and she is determined to win. Her playing is so great that the entire opposing team is forced to block her. Kaoru is injured during the game and blood spurts from her chest.

Nanako realizes that she has fallen in love with Rei, but is too nervous to say anything. One of her letters to her "Brother" end up in Fukiko's possession and she must face her wrath.

After Nanako accidentally misses her bus stop, Rei takes her to the park. The two spend a happy morning together, and in a burst of emotion, Nanako confesses her love.

Rei refuses to react after hearing Nanako's confession and begins to intentionally avoid her, breaking Nanako's heart. Kaoru, sensing Nanako's pain, tells her to give up on Rei, for "her soul is enslaved by a goddess," referring to Fukiko.

Nanako and Tomoko decide to go to Takehiko's university fair. They invite Mariko, but she is reluctant because she thinks the men will corrupt Nanako.

Fukiko continues to pretend that nothing is wrong. At the final Sorority meeting, none of the members arrive. Rei attends the meeting instead, and encourages Fukiko to continue with her speech.