Sunazara Chimitsu

Sunazara Chimitsu (砂皿 緻密) is a mercenary famed for his sniping skills, and is known by both Anti-Skill and the Dark Side of Academy City. His career virtually ends during the events of October 9 after he is grievously injured during a battle against ITEM as an operative of SCHOOL.

Appearance
He appears as an adult man with strong facial features. He wears his black hair short.

Toaru Kagaku no Railgun: Uiharu SS
On August 1 he is hired by the higher-ups and answers to Kouji Masakage of Anti-Skill to destroy an overpass leading to School District 3 as a vehicle carrying 1500 kilograms of hydrazine has been remotely hijacked by a terrorist and was heading there. He successfuly destroys the overpass fulfilling his mission.

Battle Royale Arc
October 9th

He is hired by SCHOOL as a replacement for the sniper that was killed by ITEM three days prior to the start of the arc for their plans on assassinating Oyafune Monaka. According to Tsuchimikado Motoharu he was employed just from the ¥700,000 referral fee, and thus he's one nice bargain item for SCHOOL especially at such short notice.

He then meets up with Management to aid with the operation, preparing a MSR-001 as the weapon as well as the plans for the assassination. During Oyafune Monaka's address to the students regarding suffrage for the children of Academy City, he attempts to take a hit on Oyafune Monaka. He first disables the Wind Defense devices protecting her from the sniping, but doing so alerted the presence of Tsuchimikado Motoharu and Accelerator. Before he can shoot her, his efforts are foiled by them creating a commotion, an explosion, forcing Monaka and her bodyguards to leave in haste. Realizing that it was too late and that shooting Monaka would be close to impossible, Chimitsu decides to retreat. Before doing so however he decides to investigate the explosion. Here, he sees that the explosion came from the Wind Defense and later sees Accelerator emerging into the scene, staring directly at Chimitsu. As he disassembles his rifle and begins packing up, he promises to remember Accelerator's face. Despite his failure, his attempt allowed SCHOOL to easily infiltrate the Elementary Particle Engineering Laboratory due to the change of security in response to the assassination attempt in order to steal the Tweezers.

Later, after Frenda Seivelun betrayed ITEM's location to SCHOOL, he and the Girl in the dress accompany Kakine Teitoku to attack the Private Salon in School District 3. He is in the lobby when he begins shooting at Kinuhata Saiai. Although the force of his bullets using the MSR-001 is able to knock her back her ability the Offense Armor protects her from being killed by them. After analyzing the bullets, Saiai is able to determine Chimitsu's hiding spot. From there, Saiai uses Handheld anti-tank missile warheads to attack his approximate location. He is later presumed dead by even Teitoku.

Toaru Majutsu no Index Light Novel Volume SS2
Three days prior to the Fourth Friday of July.

He has a debate with Stephanie Gorgeouspalace on the practicality of sniping and referring to it as old fashioned. With her listing off all the difficulties a sniper has to face like with wind altering the bullet’s trajectory, the target just happens to move at the last second, if they’re wearing any bulletproof equipment, or the fact they might not be killed in one shot. He then retorts by asking her what other way to carry out an assassination is there besides sniping? He then points out an unknown group that are faking psychic powers who had been gathering money by saying that they’ll develop psychic powers in a different way than Academy City if they get investments. Her response was simply to say that it would be easier to deal with by using a missile launcher. He allows her to do this job her way, while at the same time calling her a heretic.

The Fourth Friday of July.

Stephanie was sobbing because despite successfully killing the target the news reported that he miraculously survived. This was due to the fact when she killed him and his bodyguards all at once with the missile launcher, they hid the body and the fact that he died and then reported that he survived. Sunazara then explains why he told her not to use a missile, by blowing all of them away makes it a catastrophe, while efficiently displaying the body they can’t fool anyone. To the client, it doesn't matter if the target is truly alive or dead. Socially, their target is still alive. The ability to reliably kill the target in every meaning of the word is the quality looked for in an assassin. The old fashioned methods are used in modern times because of how effective they are. As he watches the news he surmises that the situation is salvageable as the target was likely having used a body double, and tells her that she has been given a chance to live on due to her complete lack of skill. He also, somewhat ironically, told Stephanie that he would never be killed in an explosion no matter what.

DRAGON Arc
He survives the blast, though grievously wounded and was kept alive by Thomas Platinaburg to use as a bargaining chip to hire Stephanie Gorgeouspalace, although his body was tampered with in an attempt to assure Stephanie's cooperation. Later it was revealed that he was the mentor figure for Stephanie Gorgeouspalace, who would seek to avenge him in by killing Kinuhata Saiai.

Agitate Halation Arc
Despite still being in a coma, according to Stephanie Gorgeouspalace, Chimitsu is hired by Academy City to lend his sniping experience via electronic equipment.