Unaired episodes included in the third and fourth Blu-ray/DVD volumes. 
Entry includes: 

1) Bottom-Tier Character Tomozaki: Post-game equipment for girls is a little different than usual 
After stopping for lunch at the café where Kikuchi works, the gang chats about love and dating while she tries to listen in--and stay out of sight. 

2) Bottom-Tier Character Tomozaki: Most strange spell names have unknown origins 
Aoi, Mimimi, and Tama reminisce about the early days of their friendship and a fireworks show that provided the inspiration for Tama's nickname. 

(Source: Crunchyroll)

Episode 1 - Say what you want; famous games are usually fun

Episode 2 - It feels awesome to gain a bunch of levels after a battle

Episode 3 - When a girl's your first friend, life feels like a date for a while

Episode 4 - Sometimes you conquer a dungeon only to find a strong boss back in your village

Episode 5 - The characters who become your friends after you clear a hard event usually have high stats

Episode 6 - Once you start speedrunning the minigames, you seriously can't stop

Episode 7 - When a mentor character becomes a boss, they'll push you to the edge

Episode 8 - There are some problems a bottom-tier character can't fix alone

Episode 9 - When you go back to the starter town with the full party, new stuff tends to happen

Episode 10 - Multiplayer games have their own special appeal

Episode 11 - A single choice can change everything

Episode 12 - Equipment for girls has special effects

Episode 13 - Post-game equipment for girls is a little different than usual

Episode 14 - Most strange spell names have unknown origins

project No.9

Bottom-Tier Character Tomozaki OVA