Tsuda Takatoshi is about to begin his first year in Ousai Academy. His decision to enter Ousai was based upon it being close to his home and he paid no heed to the fact he'd be among the first boys to enter the recently gender-integrated school. 
On his first trip to school, Takatoshi is surrounded by girls; the train has nothing but girls, the walk to school has nothing but girls and once he finally arrives he is approached by a group of girls and summarily appointed vice-president of the student council and, as expected, he is the only boy there. 
Now Takatoshi finds himself surrounded by crazy girls who do nothing but horrify him with their candid conversations about feminine hygiene products and, what's worse, assume he's the worst kind of man, the kind who doesn't clean himself and watches porn all day long.

[Blog](http://blog.excite.co.jp/matsukimiyu/)

She was a voice actress affiliated with 81 Produce. Matsuki was a graduate of Hiroshima Jogakuin Junior & Senior High School and Keio University where she majored from the Faculty of Environment and Information Studies. 

Her parents were officially against her becoming a voice actress but permitted her to move to Tokyo and visit the Keio University after she passed an entrance exam for it. After graduating from university she started pursuing her voice acting career and went at the same time to the Nichinare narration school and the Aksent voice acting school, where she later signed under after becoming professional.

She made her debut under her real name, Matsuki Mieko (松木美愛子) in 1988 on Nude Maker's PlayStation game Mikagura Shoujo Tanteidan. But changed shortly after to using a pseudonym instead as to protect her name.

In 2000 she passed an audition and became a member of newly established pop act Up Up under the Akatsuki Project label. In 2002 she got her first major role in an anime tv series, Shichinin no Nana. During the same year, in June, she quit Aksent and signed with talent agency 81 Produce. She became a regular on two radio shows, Sakurai Koubou and Cherry Bell in October 2002. The following years saw her involved with the Da Capo franchise a visual novel, adapted into an anime, where she played one of the main characters, Sagisawa Yoriko.

Matsuki had been under treatment for acute pneumonia since July 2015. She was diagnosed with a malignant lymphoma caused by the chronic active Epstein–Barr virus infection (CAEBV) and passed away on October 27th 2015. A posthumous charity event had its proceeds go to CAEBV research, which, along with the medical history of her rare case, has helped establish the disease's mechanism of infection and possible treatment.

(Source: Wikipedia)

It is the start of Takatoshi Tsuda's second year as the put-upon vice president of the student council and his sister Kotomi is entering school as a first year. New friends and double entendres are made.
 
(Source: Anime News Network)

The second season of Seitokai Yakuindomo.

OVAs of Seitokai Yakuindomo* which were either bundled with the limited editions of the manga volumes or as standalone OVAs.

Tsuda Takatoshi, a new student in the recently gender-integrated high school, is asked to join the student council, as the vice president. Thus begins his days as the only normal person in among the 4 member student council officers...
 
Note: The first 15 chapters were published in Magazine Special. It switched to Weekly Shounen Magazine starting with Ch. 16, with the chapter count being reset. This entry still includes the first 15 chapters from Magazine Special.

Suzu no Haha