From Tokyopop:

Confidential Confessions is a shocking new manga series that deals with many of the hard-hitting issues that teens face today. Using emotionally moving storylines and multi-dimensional characters, each groundbreaking volume tackles such topics as teen prostitution, rape, HIV, stalkers, suicide, and sexual harassment.

V.1 - Tobira (MOMOCHI Reiko)
1-3. The Door
4. Mistakes

V. 2 - Namida (MOMOCHI Reiko)
Tears

V.3 - Memai (MOMOCHI Reiko)
Dizziness

V.4 - Itami
1. Pain
2. Distortion
3. Tomorrow
4. Forbidden Kiss

V.5 - Himitsu (MOMOCHI Reiko)


V. 6 - Uwasa

Series order as published by Konansha:
1: Itami (いたみ) (Pain)
2: Himitsu (ひみつ) (Secret)
3: Memai (めまい) (Vertigo)
4: Uwasa (うわさ) (Rumor)
5: Namida (なみ� ) (Tears)
6: Tobira (とびら) (Door)