If you're looking for manga similar to Baby Boom, you might like these titles.
During a class reunion, the school became an enclosed dimension without warning. Yelling and screaming brought no response. 26-year old unemployed Haruka Sato has to survive by cooperating with seven of his former classmates. Soon, the extreme conditions began to eat away at their sanity, and Haruka's hidden desires began to take hold.
New Japan Airlines, flight 179 from Narita to Osaka, has been hijacked by terrorists. Inside the plane, everyone is panicky, experiencing terrible violence and fear. Under such hopeless circumstances, a young negotiator happens to be on board the plane, among the 230 passengers. The lives of all are in his hands.
Kurushima Akira is a member of the Japanese Society of Thanatology, which offers illegal euthanasia services to those who "desire a worthy death." People who wish to die come to Kurushima, asking him to keep watch over them in their final moments.