From MangaHelpers:

Fudatsuki Kenji is known in school for two things: for being a delinquent and for having a sister complex. He constantly follows his sister Kyoko around, fixing her giant ribbon and chasing off any boys who might be interested in her. However, the truth is much stranger than people believe. He actually doesn't have a crush on his sister-- in fact, he likes Hibino, the only girl in class who isn't afraid of him.

The problem is that his sister is literally a monster. She's a jiangshi (vampire), who is much stronger than an ordinary person and who needs a certain amount of blood from Kenji each day. Her ribbon keeps her in check, but if it comes off, she instinctively attacks the nearest person. Her ribbon also has a huge affect on her personality. With the ribbon, she's irritable and sharp-tempered, but without it, she's extremely sweet and apologetic (while she attacks). Will Kenji be able to keep his sister from hurting anyone, and maybe find some way to overcome his sister-complex reputation enough to have a chance with Hibino? [tethysdust]

The main characters are three school girls and the stories revolve mostly around their talks and what they do in life general. Art is simple and clean. The background is usually something "non existence." Comedy comes from the girls different personalities and ways to adapt into situations in life.
Mina is the active and usually starts things. Yukari is the class rep and usually follows Mina's lead. Sanae is a member of the Track club and most inactive part of the group. She prefers to stay cool and act rationally.

(Source MU)

The plot centers on the titular Tsubaki Kunoichi, the best student in her school, and a curiosity that she cannot reveal.

(Source: MU)

A girl from the Edo era somehow time-travels to modern Japan and finds the reincarnation of her dead lover in Tokyo... a middle school kid. He wants nothing to do with her. A little "get to know you" story.

Kazuki's sister brings home a stray cat, who is actually a middle aged man in disguise.

Ayumu wants to beat his senpai at shogi so he can confess his feelings.

Although the day of his victory is still nowhere to be seen, this is the story in which he may 'checkmate' her by other means.

(Source: MangaDex)

Takagi-san, this girl who sits next to me, is always teasing me. But you'll see—today's the day I'm going to prank her back and embarrass her!!

(Source: Shogakukan)

The manga has been drawn and released by Souichirou Yamamoto @udon0531 on Twitter.
The author didn't plan to continue the manga at first, but he has decided to continue.
Since he has drawn the manga when he has free time, the update schedule is not stable.

(Source: Mangadex)

A story about a girl's short-lived quest to become more interesting in order to catch her crush's attention.

Venturing into the hills to find her dog who ran away, Hitomi finds a strange lizard girl who is feeling lonely.