Yondome wa Iyana Shi Zokusei Majutsushi

Amamiya Hiroto is unlucky. His life consisted of misfortune after misfortune, culminating in an unlucky death during an incident on a school boat trip, trying to save a girl he barely knew. After death, he met a god of reincarnation who requested that the hundred or so dead passengers – one of them being the girl he tried in vain to save – be reincarnated into another world.