From Asahi Net LTE (ANSIM) Settings and Connection Guide, "High Speed" (not 128k) LTE connection information:
SIM Card Data SIM/Voice SIM
Plan 3/7/20/50 Giga Plan, 110 MB/Day Plan
APN lte.mobac.net
User Name d@w.asahinet.jp (f@ for fixed IP addr option)
Password 0000
Auth Type PAP or CHAP