Mary Skelter: Locked Up in Love – Blood High

Set in a private high school called Blood High, many students with strange abilities study and enjoy their youth at the school. The spooky Jail Tower looms over the school grounds. There are rumors that if a couple confesses to each other under the Tower, they will be bound forever and ascend to the top.

The story begins with Jack, who has a surprise birthday party coming up that he has to pretend he doesn't know about and choose a girl to confess to under the Jail Tower.

[From Mary Skelter Wiki]

A spin-off that was included as a pre-order bonus for Mary Skelter 2 on the Playstation 4. It will also be included in Mary Skelter: Finale's "Adventure Mode".