Himitsu.

1. A Passing Story
   

A school doctor recounts a romance from her own school days.

1. Pink
   

A love triangle. It's set in the same school as "A Passing Story."

1. Romance
   

A couple from the same school as "A Passing Story" and "Pink."

1. Lover
   

Continues "A Passing Story" story in the present.

1. Himitsu. (Secret Love)
   

A girl deals with heartbreak.

1. Toiki (Sigh)
   

Shiratori, now in college, despairs of ever finding love.


(Source: Lililicious)