Oniisama e... episodes

Nanako Misonoo enters Seiran Gakuen Girls High School and is assigned to Class B.

The nomination day has come. The nominees from Class B are Mariko Shinobu, Kaoru Orihara, and Nanako.

Nanako suffers from nasty harassment after being nominated to Sorority. On the verge of collapse because of the cruel bullying, Nanako thinks of declining the invitation to the party, which is to select the official members.

The day after the party, the finalized list of the new members is announced. Both Mariko and Nanako are listed. Nanako is surprised that she had been accepted even though she had not attended the party.

On the day of the entrance ceremony to Sorority, Nanako and fellow students are summoned for the preparation.

After Nanaoko is accepted in to Sorority, everyone at school is hostile to her, even Tomoko, her best friend. One day Nanako is unable to find her sports bag which she had brought for sure.

Persuaded by Miya-sama, Nanako decides to stay in Sorority. However, the unable to bear the continued harassment, she escapes to the clock tower.

Mariko feels uneasy about the restored friendship between Nanako and Tomoko. She invites Nanako to her birthday party. Although afraid of Mariko's eccentricity, she can't decline the invitatio

Nanako, who witnessed snippets of Mariko's insanity, realizes she cannot be open with her. One day, Kaoru suddenly collapses.

Kaoru worries about Mariko, who is growing more gaunt by the day. But Mariko is unable to accept her kindness, thinking that popular people like Kaoru cannot understand her loneliness.

Sorority members are attending the customary study meeting for the mid-term exam. Fukiko unusually invites Saint-Just and makes an appointment to meet under the elm tree in the courtyard at 5:00.

Kaoru visits Rei's home. Irritated at Saint-Just who is unable to shake her longing for Fukiko, Kaoru snatches from her arm a bracelet which symbolizes her obsession with Fukiko.

Although it is already past midnight, Nanako cares for Saint-Just, together with Kaoru. Nanako envies Kaoru and Saint-Just since she has never experienced such sympathy and friendship as exhibited by the two.

Saint-Just's words imply that she and Fukiko once tried to commit suicide together. Although the mid-term exam is near at hand, Nanako cannot stop thinking of Saint-Just.

Junko Nakaya, a first-year student in Class C, fails to rank in the top 50 in the mid-term exam, due to a fever. She is ordered by Miya-sama to voluntarily quit Sorority.

Kaoru participates in the first practice game since her comeback. Mariko, with a newfound adoration for Kaoru, tries to bring Tomoko and other students with no interest in basketball to cheer her on.

Kaoru leaves the hospital in just one day, and Mariko greets her with rapturous delight. Nanako is impressed by Mariko's honest display of love and envies her innocence.

Nanako happens to miss the bus stop for the school and ends up playing hooky with Saint-Just. Walking in a park, they run into Takehiko Henmi and his friend Takashi Ichinomiya.

Wondering how Saint-Just had interpreted her words, Nanako is uneasy. She becomes emotionally unstable, bursting into tears during class.

Nanako is invited by Takehiko to his university's festival and is delighted. On the other hand, Miya-sama is beside herself after finding out and summons Nanako to have tea with her the morning of the festival.