Nyan Koi! (TV)

In ep 4, around 19:58, the flashback about Nagi shows 4 other girls from the anime "Saki," with the exception that they have different hair color. In order from left to right: Nodoka, Hisa, Yuki, Saki.

There is a calico cat name Tama (but it is a female), who is the station master at Kishi Station in Kinokawa, Wakayama Prefecture, Japan.

In ep 11, during eyecatch around 11:46, Kousaka almost said "imagine breaker," the name of Kamijou's ability from Toaru Majutsu no Index.

in ep 12, Kawamura is dressed up as a basketball player and said "cause i'm a genius" is a reference to Hanamichi Sakuragi in Slam Dunk. even Sakuragi's trademark around-the-body warming up exercise was referred.

Episode 9: About 12 seconds into the episode, Haruhiko Endou has a Magical Girl Pretty Sammy (from the Tenchi franchise) figure attached to his backpack.

In ep 10 at 11:39 a yukata clan Hatsune Miku look alike is attached to Haruhiko's backpack in the form of a keychain.

In ep 6 at 23:30 till 23:45 a super sentai parody is depicted.

At about 00:53 in episode 3 Junpei watches Mizuno do a high jump though a chain link fence. This is very similar to a scene in Suzuka, in which the main character Yamato watches Suzuka do a high jump and comments on how dazzling she looks.

In episode 4 (07:16min) in Sumiyoshi Kanako's imagination, while Junpei is kneeling on her feet, there are many cat laughing around them, one of the cats is a black version of Nyanko-sensei from Natsume no Yuujinchou

In episode 7, the bus driver has an uncanny resemblance to Shinichi Watanabe, also known as Nabeshin from "Excel Saga".

In episode 8, at 11:43 the cat Micchi uses the heads up display from the game Metal Gear Solid 4.