I’m a former hero returning from another world, but I was involved in a death game Isekai-gaeri no Moto Yuusha desu ga, Death Game ni Makikomaremashita

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Isekaito is on a school trip with his classmates, enjoying his daily life as a normal high school student, when he is suddenly caught up in a death game controlled by a man in military uniform. The weak will die and the strong will survive... but what the man doesn't realize is that there is a powerful former Hero from another world amongst them.