Hello Kaito!
This two choices needs to be clarified a little. When picking the first choice the swim club will disappear and the Meiko quests says "Have sex with Meiko with the help of the Occult club", but Meiko cannot be seen both in the pool and the club management during this route (bug maybe). Which is probably why many got confused or stuck because Meiko cannot be found anywhere.
The romance branch should be change to (Romance / Blackmail branch) because after choosing that branch, the player can follow what the Meiko quest say or go to the Beach have a chance to blackmail & corrupt her instead.
