|School||Houjou University Attached High School|
|Class||3E (High School)|
|Physical and Vital Statistics|
|Game||All the games|
|Novel||Volume 1 Chapter 1|
Kazusa Touma is the secondary heroine and the main love rival in White Album 2: Introductory Chapter and Coda. In the anime, she ascended as the main heroine.
Touma is a the daughter of Youko Touma, a wealthy world-renowned trumpeter. Her mother's absence made her rebellious. Due to her numerous absences, the teachers decided to transfer her from Houjou's music division to a regular class in her third year. However, she still continues dozing, skipping, or being late in class. Her school attendance slightly improved until the cultural festival.
Touma and Haruki are first seen together sitting next to each other in class. Haruki tried to talk to her but she remained silent, feigning sleep. When Haruki goes to Music Room 1 to practice his guitar, he hears a piano playing in the Music Room 2 next to him. The piano plays "White Album" along with him, and Haruki plays with the mysterious saxophone every day after school. Finally, when Haruki asks Setsuna to join the Light Music Club, she accepts but only if the piano player joins them. Therefore, Haruki is determined to find out who his saxophone partner is. He climbs the ledge of the school building to get into Music Room 2, and he nearly falls, but someone's hand catches him and pulls him up and he finds out his piano partner is Touma. After much persuasion, Touma decides to join the Light Music Club for Setsuna. After various ups and downs, the two confess their love for each other and consumate their Love during the final night. It is also revealed that Haruki written the song Todokanai Koi for Touma.
Touma has loved Haruki since they first met, but has always hid her feelings away. While she is not nearly as compatible with Setsuna as she is with Haruki, Touma still cares about Setsuna, as does she to her.
Their next encounter would happen in Coda after many years, where we can see a new Kazusa more determined to get what she wants in her own route after lots of suffering without Haruki. Despite having become one of the best pianists worldwide Kasuza would gladly never play music again if it meant that she could have Haruki.
Touma and Setsuna become extremely close friends over the series. Touma once said Setsuna would either be her sworn enemy or her closest friend, and they end up becoming friends, supporting each other in girl-related dilemmas. Setsuna confides much in Touma, and as a result, the two grow close over music and conversation. Setsuna sees Touma as somewhat of a rival, because they both love Haruki, who started dating Setsuna after she confessed to him. Setsuna knew full well Kazusa was also in love with him and feels sorry for betraying her. When Haruki sleeps with Touma behind Setsuna's back she remains very supportive of Haruki even though it's killing her inside. Overall, their personalities are quite a stark contrast, but after growing close through the Light Music Club, become the best of friends until Setsuna confesses to Haruki.
Youko is Touma's mother and an acclaimed trumpeter. Known for being carefree, Youko gave birth to Touma illegitimately and left her in Japan when she moved to Paris. Touma has a frosty relationship with her mother, as she dislikes her for leaving her in Japan. Youko is shown to be very loose and inconsiderate of her daughter's feelings. For example, when Touma had her flashback, Youko is shown simply smiling at Touma's despair. Touma states that she had aspired to be as great as her mother since she was young, but after Youko left for Paris, all her dreams evaporated. The relationship between the two is chilly at most, and Touma is still bitter against her mother.