If you're looking for manga similar to Tokai no Tom & Sawyer, you might like these titles.
My friend Ozawa, who has gone missing. He was an editor of an occult magazine, and before his disappearance, he had covered ghost stories related to an area called "●●●●●". Quotes from past magazine articles, strange stories from readers, and Internet bulletin board posts - as we follow his footsteps and decipher the materials he had collected, certain connections emerge between the ghost stories that had been treated as separate incidents.
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...
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!
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!