Shindere Shoujo To Kodoku Na Shinigami

the heroine, akira, a 2nd year middle school student, lives on an island that being peaceful is its only feature. everyone in her class are her childhood friends. they were thinking that this year too like the other years would be a peaceful year with the usual classmates. but at a time like this a transfer student called “matsushirou nishigami” appears, saying: “anyone who gets close to me dies”. what is the true meaning of his words…?!