From Sekaipedia

There are 5 attributes in Project SEKAI: cool, cute, happy, mysterious and pure. Every card has an attribute and every event has a bonus attribute. Cards that share the bonus attribute provide extra event points for that event. The power of cards can be increased by upgrading area items associated with that attribute.

Attribute Icon
Cool Icon attribute cool.png
Cute Icon attribute cute.png
Happy Icon attribute happy.png
Mysterious Icon attribute mysterious.png
Pure Icon attribute pure.png
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