An OVA of Highschool of the Dead bundled with the 7th manga volume.
Komuro and the gang stumble upon a deserted tropical island that looks to be free of zombies. They make use of this wonderful opportunity and dress up in skimpy swimsuits and have lots and lots of fanservice fun.
Hallucinogenic substances are involved.
Highschool of the Dead: Drifters of the Dead is finished and has 1 Episodes. It is also Known as: 学園黙示録 HIGHSCHOOL OF THE DEAD ドリフターズ・オブ・ザ・デッド, High School of the Dead OVA, Gakuen Mokushiroku: Highschool of the Dead, HOTD, HSOTD, Drifters of the Dead
Genres: Post Apocalypse, Romance, Japan, Ecchi, Action, Zombie, Earth, Asia, Horror, Stereotypes, Violence, Present, Comedy, Shounen
Top 8 Anime Like Highschool of the Dead: Drifters of the Dead
8. Sounan desu ka?

Because of a plane crash…starting today, we're spending the springtime of our lives on a desert island!! There's nothing here, so we have to make everything!! And eat everything!! Check out our high school girl survival story of courage and knowledge. We're actually doing pretty well! How to eat cicadas, how to build traps, a simple allergy test, how to eat hermit crabs, etc.
Are You Lost? is finished and has 12 Episodes. It is also Known as: ソウナンですか?, Sounan desu ka?
7. Toaru Kagaku no Railgun: Entenka no Satsuei Model mo Raku Ja Arimasen wa ne.

Special beach episode bundled with the official visual book.
A Certain Scientific Railgun: Episode 13' - Being a Photo Shoot Model Under the Hot Sun Isn't Easy, Is It? is finished and has 1 Episodes. It is also Known as: とある科学の超電磁砲(レールガン) 13'話『炎天下の撮影モデルも楽じゃありませんわね。』, Toaru Beach no Tokuten Eizo, Toaru Kagaku no Railgun: Episode 13' - Being a Photo Shoot Model Under the Hot Sun Isn't Easy, Is It?
6. Naoko no Tropic Angel: Hyouryuu

One of the first adult OVA. Released in 1985. The Naoko in the title refers to the original author, not a character.
Naoko no Tropic Angel: Hyouryuu is finished and has 1 Episodes. It is also Known as: 直子のトロピックエンジェル 〜漂流〜, Naoko no Tropic Angel Hyoryu
5. Isuca: Gokuraku

The OVA will be bundled with the 7th volume of the manga, scheduled to ship on August 26, 2015. It will be a sea bathing episode.
Isuca: Gokuraku is finished and has 1 Episodes. It is also Known as: ISUCA 第拾壱話「極楽」, Isuca OVA, Isuka OVA, Isuca ep 11
4. Akaneiro ni Somaru Saka: Hardcore

Everybody goes on vacation to Ayanokouji's private island for fun in the sun. Hilarity ensues.
Akane Iro ni Somaru Saka Hardcore OVA is finished and has 1 Episodes. It is also Known as: あかね色に染まる坂 Hardcore, Akane-iro ni Somaru Saka OVA, Akaneiro ni Somaru Saka OVA, Akasaka OVA
3. Higurashi no Naku Koro ni Kira

With things such as story out of the way, Higurashi cranks up the fanservice with Kira, a new OVA series to commemorate the series' 10th anniversary, featuring nail-biting situations such as Rika and Satoko becoming magical girls to battle evil magic crime syndicates with the help of their trusty squad of cheerleaders, among other things.
The excitement may be too much to handle. Do you dare step inside the... "different" world of Higurashi no Naku Koro ni Kira?
When They Cry Kira is finished and has 4 Episodes. It is also Known as: ひぐらしのなく頃に煌, Higurashi no Naku Koro ni OVA 2, When They Cry Glitter
2. 11eyes: Momoiro Genmutan

Extra Blu-ray/DVD Episode 13 included on vol. 7.
In this special episode, Kakeru and the team enter a "Pink Night" instead of red. The "Black Knights" are now "Pink Ero-Rangers" and Lisolette is a bondage driver. The team's powers are also warped with an erotic twist. Kakeru can see through clothes, Yuka can change the boys into girls, Misuzu's swords are vibrators, Kukuri can speak, but only says and draws profanities, Yukiko becomes sexually excited when she takes off her glasses, and Takahisa shoots a small spout of water from his finger. This episode is merely a parody and is in no way related to the original storyline.
11eyes: Momoiro Genmutan is finished and has 1 Episodes. It is also Known as: 11eyes 桃色幻夢譚 ~rö zsaszí n é jszaka, 11eyes Episode 13, 11eyes OVA, 11eyes -Tsumi to Batsu to Aganai no Shoujo- Episode 13
1. Gakkou Gurashi!

SCHOOL-LIVE! Focuses on the lives of 4 girls who decide to stay over at school: Yuki Takeya, Kurumi Ebisuzawa, Yuri Wakasa, and Miki Naoki. Along with the school adviser Megumi Sakura, they suddenly find themselves to be the final survivors of a zombie attack, and continue to live and survive at the school.
School-Live! is finished and has 12 Episodes. It is also Known as: がっこうぐらし!, School Live!