/jp/ - Otaku Culture

>>46119982
most of the girlfriend's mother/daughter's boyfriend series are already well-known and easy to find so I won't hit you with the usual suspects. instead, here are some kinos that might have flown under your radar. that said, I can't remember which ones are explicitly highschoolers or just generic young couples. also, none qualify for your bonus points
>VEC-589 Reiko Seo
Reiko visits her daughter and meets her bf
>ROE-173 Rieko Hiraoka
Rieko has an extreme crush on her daughter's bf and forcibly invites herself/crashes the young couple's romantic hot spring trip
>PPPD-506 Rena Fukishii
this is actually part of the girlfriend's sister series BUT the studio would rename it to "mother" whenever an entry starred an older actress - this is one of them
>MEYD-873 Ai Sayama
pic related

if you're newer to this and you DO want the more famous series that I've omitted here as well then let me know