The story revolves around a boy named Leo and his girlfriend Shion, who has the unique ability to see ghosts. A mysterious ghost kidnaps Shion and forces her to marry him. The ghost creates a wedding invitation and plans to hold a ceremony, but Shion secretly writes a hidden message on the invitation in a code that only Leo can decipher. Leo receives the invitation and notices the hidden message, which tells him to bring a sword. He attends the wedding ceremony, and with the sword, he is able to rescue Shion from the ghost.
Here are the key facts extracted from the text:
1. The protagonist is training with Reiko to acquire various powers.
2. Reiko is teaching the protagonist a technique called "total concentration breathing" to help them see spirits.
3. The protagonist wants to marry a girl named Shion, who they think is the perfect person for them.
4. Shion is taken away by a ghost, and the protagonist asks Reiko to help them find her.
5. The ghost who took Shion is planning to marry her and is looking for a way to make her agree.
6. The ghost creates a wedding invitation and plans to invite Shion's friends and boyfriend, Leo, to the wedding.
7. Shion writes a secret message on the invitation using a code that only she and Leo can understand.
8. Leo deciphers the message and comes to the wedding with a sword to rescue Shion.
9. The ghost is unaware of the code and the message, and is surprised when Leo arrives with the sword.
10. The protagonist and Reiko are relieved that Shion did not marry the ghost.