A university student wants to become closer with another student so his friend recommends an exchange diary. I think it was four people writing in the diary (mc, girl he is interested in, his female friend, and a possible rival who might have also been female).
Primary:
Sky
Slate
Blackcurrant
Watermelon
Strawberry
Orange
Banana
Apple
Emerald
Chocolate
Marble
Secondary:
Sky
Slate
Blackcurrant
Watermelon
Strawberry
Orange
Banana
Apple
Emerald
Chocolate
Marble
Pattern:
Blank
Waves
Squares
Notes
Sharp
Wood
Rockface
Leather
Honey
Vertical
Triangles