Kotono Watanabe

In the blink of the mind's eye, Ryouta Sakamoto suddenly finds himself transported from playing the hit Btooom! video game to being stranded on a mysterious island, equipped with a day's worth of provisions, a bag of bombs, a strange crystal embedded in his left hand and a huge gaping hole in his memory. But it doesn't take long to figure out what's going on, especially after the first person Ryouta meets tries to kill him. (myanimelist.net)

Once upon a time, there were two neighboring countries that did not get along. They bickered over trivial things day in and day out. Finally, they went to war over the issue of cleaning up dog feces. God intervened in a hurry and said to the chiefs of the two countries. Country A gives its most beautiful girl to Country B as a bride and Country B gives its wisest young man to Country A as a bridegroom. Then, the princess of country A, Saara, happens to meet a young man from country B...!