Hey, I'm sorry it's your fault.

Hikari has had a great time settling in as a teen volunteer at Sunnyside daycare and orphanage. Her brother is also working there, and she's created bonds with the orphaned teens and other volunteers, as well as the children she cares for. She and her brother Akari, as well as the other volunteers and caretakers, all live there. One day, a new volunteer named Emmi comes. She's 13, and her half-sister is an orphan already living there. At first, Hikari is overjoyed to have a new volunteer. But she quickly realizes Emmi is bad. After Hikari tries to help Emmis younger sister, Olive, from sand getting lodged in her throat, Emmi does everything she can to turn everyone against Hikari. So, when one of the teens Hikari cares for tries to kill herself, Hikari tells her they can die together.