Mahou no Dennou Shoujo Maria

first story *
An electronic fairy gives a gamer girl a disc which allows her access to the world of virtual gaming - even H games.

second story *
A "mad chemist" sells any kind of drugs buyers need at her pharmacy from hair tonics to penis growth pills for two lesbian lovers.

third story *
an exhibitionist girl likes to go to the arcade and have group sex

last story *
Maria finally upgraded her computer space for virtual-OS maria - only virtual maria uses up all the space fairly quickly