Lock On! is a shonen manga by Kenta Tsuchida. It's 18 chapters long plus the original one-shot.

The story follows Kurihara Niko, who DoesNotLikeMen, as she becomes friends with Sanada Utsuru, a ChivalrousPervert who is a professional photographer at the age of 17. After transferring into Niko's class, Sanada decides to start a photography club with Niko's friend, [[TheDitz Yuki]]. Sanada also has a special power called "Shutter Eye," which he can use to remember everything he sees perfectly.

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!!''Lock On!'' provides examples of:

* AllMenArePerverts: Zig-zagged: Most of the guys who show up for a chapter or two end up sexually harassing someone, while Sanada is a ChivalrousPervert, Yamato is only interested in Yuki, and everyone else is fine.
* BerserkButton: Yamato is very protective of Yuki. Sanada doesn't like to see someone make a girl cry. When he ends up doing it himself, he jumps out a window...
* BlessedWithSuck: The day after Sanada uses his eye too much, he goes crazy.
* ChivalrousPervert: Sanada
* TheDitz: Yuki
* DoesNotLikeMen: Niko (This is changing)
* EyepatchOfPower: Sanada uses one to cover his Shutter Eye.
* FaceOfAThug: Yamato and his father.
** Niko also cultivates one intentionally, in order to keep men from hitting on her.
* GenkiGirl: [[ShrinkingViolet Matsuri]] whenever she takes off her glasses.
* HandWave: In-universe: Sanada's explanation for all of his abilities is: "I'm a photographer."
* JerkWithAHeartOfGold: Yamato and Ueno
* LivingLieDetector: Deconstructed with Sanada. His master tells him that his eye [[WhatIsThisThingYouCallLove prevents him from understanding love]].
* LoveEpiphany: [[spoiler: Niko's last line:]] "...because even I was able to fall in love with you."
* LoveTriangle: Niko/Sanada/Matsuri
* MagicalEye: Sanada's Shutter Eye is darker than his other one. He uses it to remember anything he sees perfectly and instantly.
* {{Meganekko}}: Matsuri
* OlderThanTheyLook: Machiko
* PsychicNosebleed: Sanada gets it when he uses his Shutter Eye. And whenever he takes pictures of girls.
* ShipperOnDeck: Invoked: When Sanada decides he needs to take more pictures of guys, he tries to get Yamato and Yuki together so he'll enjoy getting a picture of Yamato.
* ShrinkingViolet: Matsuri
* TeacherStudentRomance: One of Ueno's students has a crush on him. But then he tells her he's not interested. [[spoiler: It turns out he was lying, and he decides to wait until she graduates to do anything with her.]]
* {{Tsundere}}: Niko and Yamato
* VitriolicBestBuds: Sanada and Yamato
* WhatIsThisThingYouCallLove: Sanada
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