Nyan Koi! : Akari and Kotone Kirishima and Others

Kirishima twins

The Kirishima twins are daughters of a Buddhist monk and have differing personalities from one another.  Kotone is the elder twin and is attracted to misfortune and exhibits a more yandere personality.  Although, outwardly shy she is an obsessive stalker of Juynpei. She also has transformative magical powers.  Her younger sister Akari is more tsundere and antisocial do to her avoiding socializing when she was younger.  Both are aware of Juynpei's curse, but are unafected by it.

Kotone in blue, Akari in white

Chizuru Mochizuki

Chizuru is a college student and mail carrier who will often run into the gang.  She has a horrible sense of direction and will often get lost on her rout.  

Suzu Kousake

Suzu is Juynpei's younger sister and a big cat lover; which is not good for Juynpei as he is allergic. 

Shizue Kousake

Juynpei and Suzu's mother who is raising the two of them alone after her husband left for unknown reasons.  She is also a cat lover. 

Unknown:

A few pics of unknown girls.  The bottom three of the same girl who steps on a guy's head.

That Time I Got Reincarnated as a Slime: Shizue Izawa

She's an Summon who survived the events of World War II in the real world when she was 4, she was brought in the isekai world by the demon king, Leon Cromwell, and made her the vessel of the fire spirit Ifrit due to her being an failed Summon, soon afterwards, she earned the title, "Conqueror of Flames" due to her fire-type attacks and defenses. She is one of the founders of the Freedom Association, she had worked for the expansion and benefit of the Adventurer Cooperation Union and she also took part training adventurers and her successors. Later, she suffered from nightmares of Leon and Ifrit, and felt that she was unable to restrain Ifrit's consciousness any longer even with her anti-demon mask, causing her to age rapidly and her goal was to defeat Leon from tossing her aside after he saved her despite her life was at its end.