エスカレーション'95 お姉さまって呼んでいいですか?, romanized as Escalation'95 Onee-sama tte Yonde Ii Desu ka? and shortened to Escalation, is a PC-98 game developed by Melody and released on 1995.
It's the first entry of the Escalation series, which is connected to the anime Cream Lemon.
VNDB entry: https://vndb.org/v10875