Hentai Manga like Hatsukoi Jikan.

Shuuchi no Jikan

Also known as Time of Shame.

Status: Finished
Genres: Hentai

Isekai Wakarase Oji-san

Status: Finished
Genres: Fantasy , Hentai

Shishunki no Obenkyou

Status: Finished
Genres: Hentai , Romance

Puberty is a time when many become interested in the opposite sex for the first time, but Kasuga is hit more than most. She becomes so obsessed with thoughts of penises and balls that her grades are affected. Thus, when her childhood friend, Kobayashi, bets her that he will have a higher score on the next test, with the winner being able to request anything from the other, she sees her opportunity to witness male genitalia in the real world.

1-7. Shishunki no Obenkyou (思春期のお勉強, Puberty Study Session); COMIC Shingeki 2019-01, 05, 08, 12, 2020-05, 08, 11. 8. Onee-chan ni Makasenasai! (お姉ちゃんに任せなさい!,Leave it to Onee-chan!); COMIC Shingeki 2018-09

Please! Freeze! Please!

Status: Finished
Genres: Hentai

Due to low budget, the school library has no heating installed. Despite that, however, a trio of classmates have to perform their library duties, regardless of how cold that makes the two girls, Tsukami and Iidabashi. Everything appears to get solved, though, when the two discover that Mayumura has a high body temperature. That is, until Mayumura gets a boner, and, embarassed, confesses that he likes them both, after which one thing leads to another, and any complaints about temperature are slowly forgotten.

Note: Published in COMIC AUN 2019-04,2019-06,2019-08,2019-10,2019-12,2020-02,2020-04,2020-06,2020-08,2020-10.

Kite.

Status: Finished
Genres: Hentai

Bokura wa ○○ Hanare ga Dekinai Joron (僕らは○○離れができない序論); Comic ExE 29
Bokura wa ○○ Hanare ga Dekinai Honron (僕らは○○離れができない本論); Comic ExE 30
Bokura wa ○○ Hanare ga Dekinai Ketsuron (僕らは○○離れができない結論); Comic ExE 31
Chigu Hagu Stride (ちぐはぐストライド); Comic ExE 28
Hana ga Futatabi Saku Koro ni (花が再び咲くころに); Comic ExE 25
Fuuki wa Hazard (風紀はざーど); Comic ExE 22


Chapter included in the digital version
Last Chance! (ラストチャンス); Comic ExE 34

Garden

Status: Finished
Genres: Hentai

Takamine-ke no Nirinka ~Seed~; Comic ExE 9
Takamine-ke no Nirinka ~Bloom~; Comic ExE 10
Takamine-ke no Nirinka ~Lily~; Comic ExE 13
Takamine-ke no Nirinka ~Iris~; Comic ExE 25
Takamine-ke no Ichirinsou ~Gypsophila~; Comic ExE 27
Takamine-ke no Sanrinsou ~Fruits~ (高嶺家の三輪草 〜Fruits〜, The Three Flowers of The Takamine House ~Fruits~)
Shoka no Makuai de; COMIC Anthurium 2017-07
Kaiten Eigyouchuu ~Afternoon Tea~; COMIC X-EROS #21
Tousian e Youkoso!; COMIC X-EROS #17 Last Summer; COMIC ExE 16 10.5 Takamine-ke no Sanrinsou ~ampoule "0"~ (高嶺家の三輪草 〜ampoule 『0』〜, The Three Flowers of The Takamine House ~ampoule “0”~)

Akujo Kousatsu

Status: Finished
Genres: Hentai

Boku no Kanojo wa Doitsu-jin
Kokoro to Karada: Hiraita Tsubomi
Bouei Line
4-6. Akujo Kousatsu
Haijin Gamer Funtouki
Encounter
Yureru
Natsu to Kaito
Transform♥
Listen∞Lesson

Tonari no Ayane-san

Status: Finished
Genres: Comedy , Hentai , Romance

Note: A live-action AV adaptation (URE-101) was released on November 28th, 2023.

Koi no Tyunyu!

Also known as Love Infusion.

Status: Finished
Genres: Hentai

1-3. Shinyuu no Kokoroe (Best Friend's Knowledge)
A Walk With the Public Morals Committee
Futago Shimai no Kyuujitsu Plan (Twin Sisters' Holiday Plans)
Hot Motto
Take Care of His Friend, Okay?

3Piece: Maid Clothes

Status: Finished
Genres: Hentai

Note: Published in Comic ExE 22, 23