If you're looking for manga similar to Route 225, you might like these titles.
Natsuru Nanao, a 6th grader who lives alone with his mother, strikes up an unlikely friendship with the reserved and driven Rio Suzumura. Natsuru plays hookey from soccer camp that summer, and instead of telling the truth to his mother, he spends all his time with Rio and her kid brother at their rickety house, where a dark secret threatens to upend their fragile happiness.
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If you liked Route 225, you will also like Kamisama ga Uso o Tsuku, because both manga series are about children dealing with difficult circumstances, different from the norm. The atmosphere of both manga series is very similar.
Both series have an incredibly similar atmosphere, despite their differing stories. They're also both very short.
Obana is a maintenance worker and repairman, who frequently encounters stange mysteries surrounding the homes he manages... But with his extremely sharp reasoning skills, he brilliantly solves them all!
One summer day, a middle school-aged girl named Ruka accidentally kills someone who had been bullying her. Ruka says "I just wanna go somewhere far away and die," but Chihiro responds with, "Take me with you." And so, the two set out on a trip to runaway together. But when cornered by a police officer, Ruka leaves Chihiro behind and takes her own life. Thirteen years later, Chihiro is now an adult, and unable to forget Ruka, he has simply been living out his days with indifference. But then a high school student named Ruuka, who looks just like Ruka, appears before him...
Mamoru, a mediocre college student, discovers an item of darkness while searching for the missing father of his childhood friend, Yuuka. This item is a "human card" which can trap people on a single sheet of paper for buying and selling. The horrific human trading suspense now begins!
Darren Shan was an average kid until destiny brought him to the Cirque du Freak. Now Darren's been immersed into a shadowy world inhabited by vampires, werewolves, and strange creatures the likes of which he's never imagined, and his life will be changed forever!
Miyuki, an atheist, doesn't really believe in the idea of curses, even though she has a schoolmate, Yuko, who has supposedly used this method to have someone killed. Nevertheless, she supports Sayako in carrying out the ritual, in the hopes that it will give her some peace. However, after they speak with Yuko, they must face the fact that the curse may be dangerously real, and may carry with it horrific consequences. Miyuki's world is quickly spiraling into a nightmare!