せつなさに花束を

There are two stories.
In the first one main character becomes a member of the High School Residents' Association to participate in the school trip. Five people go on a trip including the chairman, but protagonist is only interested in this special someone.
In the second story main character changes schools to escape from the painful past. But he meets an old acquaintance there as well as a person who revitalizes all the past memories with a new force.