Reborn as Undead, My Life Become more Harder

High school student Kenichi Yumikawa end up died after saving his friend from been stab by her ex boyfriend.

As he lays dying, bleeding on the ground, he had time to make a joke that from he will reborn as an Undead as he regret died as a virgin.

After he let out his final breath, he suddenly woke up inside of a coffin as realised he indeed reborn as Undead.

Is he been prank or what?