Happy Mania v01-v03 (2003)

English translation of the Japanese manga Happī Mania.
Shigeta is an attractive and 'physically active' female looking for her soulmate in all the wrong places. In this day and age, love is a game people play to gain an advantage over others. Sincerity and honesty are often thrown by the wayside in an effort to get to the top. However, there are those -- like Shigeta -- who still look for true love in spite of it all. This is their story.