Years ago, astronaut Byakuya left behind precious materials in the belief that his son, the scientifically-gifted Senkuu, would one day find them. In the present, the Kingdom of Science's Kohaku and Ginrou have infiltrated the harem of the Petrification Kingdom’s leader with the help of Amaryllis, a local girl. At first, their mission progresses without a hitch. Unfortunately, an error enacted by Kohaku and Ginrou leads Minister Ibara and the Island’s strongest warrior, Moz, to identify the intruding duo as enemies. Even worse, Moz tails Amaryllis when she returns to inform Senkuu of the news, discovering the scientist's secret hideout. However, Moz's agenda does not align with Ibara's—he wants to dethrone the minister and keep the petrification device for himself. If Senkuu plays his cards right, he could gain a powerful ally and win the war once and for all.

Meng Chuan witnessed his mother killed before his eyes, so he trained very hard hoping to one day avenge her death. But his peaceful days were broken as his wedding engagement was called off, an invasion by foreign forces, the sanctuary fell into enemy hands... In order to protect the people of Ning City, he picked up his sword and vowed to be the strongest. This is a heavy responsibility and a long journey

Ryuuto Kashima is a gloomy high schooler. As part of a punishment game, he was forced to confess to Runa Shirakawa, a girl from the top of the school caste who was admired by everyone. They ended up going out for the unexpected reason of "Err, I'm free now so..." but Ryuuto ends up following and eavesdropping on Runa being confessed by a handsome soccer club member, and Runa bringing Ryuuto, whom she had just begun dating, to her own room as a matter of course. They have different friends and ways to have fun, and they are different in almost every way. Nonetheless, they begin to relate with each other after being surprised by their differences every day and accepting them.

Ron Kamonohashi, the best student in the history of the elite Detective Training Academy BLUE, has been living as a recluse since BLUE expelled him five years ago. Moreover, he is forbidden to work as a detective, having barely escaped execution after getting involved in a murder case while he was still attending the school. Ron's situation changes drastically when police detective Totomaru Isshiki, following the advice of a senior colleague, seeks him out for help with a criminal case that has remained unsolved for months. Ron reluctantly agrees to help Totomaru and uses his phenomenal intuition to discover the culprit in less than a day. However, it appears that Ron suffers from a mysterious condition that can cause those around him to lose their lives. To Ron's great surprise, Totomaru manages to save the life of someone whom Ron put in jeopardy. As the unlikely duo starts solving crimes one after another, BLUE sends operatives after its former student to find out if he has resumed investigative work. Fighting against murderers, rogue detectives, and the Metropolitan Police Department, Ron and Totomaru must join forces if they want to survive and see justice prevail.