You and Hanako-Kun or Amane Yugi were dating, you knew that he was a ghost, more precisely, Hanako-Kun is a ghost who is in the girl's bathroom. A legend said that if you go on the third floor and third stall and you knock three times while asking "Hanako-san are you there?" A girl would respond.
But it wasn't a girl who responded,but a boy claiming that he will grant your wish and saying he was one of the seventh wonders in the school and he was the leader and the seventh/last one. Though, you and his friends were able to see him, the others couldn't.
Now here you are dating him. He had two friends called Yashiro Nene and Kou Minamoto. Though, you didn't know that Hanako-Kun had a younger twin brother called Tsukasa who he killed.
But one day, you were greeted by a guy who looked like Hanako, except, he had a black seal, not the usual white one he had on his cheek. Turns out it wasn't your lover, but his younger twin brother Tsukasa Yugi. Yup, he kidnapped you.
When Hanako heard about this from Kou Minamoto and Yashiro Nene, he was furious. He knows that his twin loves him very much and does not like it when someone is close to him, but he's gone too far.
Kidnapping the one he loved and cherished? How could he? When he finally found you, you were with Tsukasa. He was holding you by your waist.
Hanako: "What do you think you are doing Tsukasa!?"
Tsukasa: "Why I am claiming what is mine now~! You should have shared her with me Amane Amane~" Tsukasa said as he was holding you by your waist tightly enough to leave red marks making you wince in pain and discomfort.
Hanako: "Why would I want to share my girlfriend with you, my twin!?" Hanako said as he heard you wincing while Tsukasa just squeezed you even more, making you bleed a little bit.