Ple-Sen
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As I understand it, the advantage here, compared to swimming and culture clubs, is that you can deliberately spend Skill Points, whereas there, it's only once a month and without spending Skill Points. And Revan confirmed that tea will become exclusive to the club. However, the value of other activities, compared to swimming/shibari, is lower, except for characters who have nowhere else to spend Skill Points. Because otherwise, you end up with a net loss of Skill Points.