青春１８きっぷ
せいしゅんじゅうはちきっぷ- 1Seishun 18 ticket ; seasonally available railway ticket for 5 days of unlimited travel on non-Shinkansen JR trains Translated by Jiyomi
Other writings and readings
青春十八きっぷ青春１８切符青春十八切符
noun (common) (futsuumeishi)
JMdict entry 2840833. Source and licence.