3.66 out of 5 from 77 votes
Satomi's entire high school is assembled in the auditorium for the announcement: her old math teacher has been murdered. The news causes her classmates to burst into tears, but the girl remains stoic, even in the face of the rude sheep that she hallucinates. But her apathy doesn't stop her from getting sucked into the case: she becomes acquainted with Yukinari, who the police believe is involved with the murder. This man reminds Satomi of a boy in bloodstained clothing that saved her life ten years ago, when the apartment building that she lived in exploded under mysterious circumstances. And though that case remains unsolved, as time goes on more and more threads are discovered connecting it to the recent murder; just how are these two cases related?
Nana is twenty four years old and has lived most of her life without any purpose. She is known to her coworkers to be indifferent and refuses to pay attention to others when they speak to her, leaving her with very few friends. However, Nana's life is turned upside-down when a car accident sends her back to her past; she awakens to find that she is now a fourteen-year-old junior high school student. As she relives her junior high school days, she slowly begins to uncover the painful memories that she had tried to repress as an adult. Will Nana's past help her find a reason to live or will it prove to be much more than she can handle?
Kanae's husband disappeared without a trace while on a union trip. Though usually headstrong and independent, the woman becomes plagued with worry over what happened to him, and is unable to move on with her life. Thus, Kanae decides to hire a private investigator, and keeps running the public bathhouse to the best of her abilities, but the detective who shows up is disheveled and eccentric. As he tries to figure out the truth about her husband, Kanae must deal with the stress from a work-intensive job, meddlesome neighbors, and recurring nightmares in which she is drowning.
Coelancanth is a mystery, whereas Undercurrent is more a slice-of-life with mystery elements, but both are strongly centered around tragic past events, strange current events, and how the two are interconnected. Both have gentle, somber moods.
After Juri's third suicide attempt, only her aunt Monica cares enough to help her. Monica is a nun who regularly visits convicts and, believing that Juri will provide some insight on these emotionally destitute men, invites her to come along. One such prisoner is Yuu, who is on death row for murder, but has refused all visitors because of the hypocrisy he sees in the religious and other self-proclaimed do-gooders. When the two meet, they realize they have lived through similar turmoil, and agree to reconvene weekly to try to make sense of their lives.
Coelancanth is probably aimed at a slightly younger audience, but the main characters in these two manga have similar(ly tragic) backgrounds. They also share the same atmosphere, and the past plays a large role in both.