Rose in a Yuri Field

Rose in a Yuri Field summary:

One day, a truck ran over me, welcoming the sudden death, I woke up in a unfamiliar room.
Checking my appearance in the mirror considering there is a silver haired beauty&h.e.l.lip; And in the nether region there are changes from mini size to extra-large size.
Apparently I reincarnated in a different world. According to G.o.d I have a spear that can cause the downfall of humanity.
Therefore with this erection I will save the world.