BUR #42978 has been approved by @nonamethanks.
create implication x-change -> x-change_(series)
create implication yin-yang!_x-change_alternative -> x-change_(series)
create implication yin-yang!_x_change_ex -> x-change_(series)
create implication x-change_r -> x-change_(series)
create implication x-change_3 -> x-change_(series)
create implication x-change_2 -> x-change_(series)
create implication x-change_alternative_2 -> x-change_(series)
2. "...offshoot of the popular X-Change series"
Old eroge with many branches. Each one already has an x-change (series) tag