Sekai-ichi Hatsukoi Wiki
Sekai-ichi Hatsukoi Wiki

Sekai-ichi Hatsukoi ~Onodera Ritsu no Baai 7~ (世界一初恋 〜小野寺律の場合7〜), or The World's Greatest First Love: The Case of Ritsu Onodera 7, is the seventh volume of the Sekai-ichi Hatsukoi manga series.


  • The Case of Ritsu Onodera No.12
  • The Case of Ritsu Onodera No.13
  • The Case of Kou Yukina No.1
  • The Case of Ritsu Onodera No.13.5


In "The Case of Ritsu Onodera No.12," Ritsu Onodera is concerned about his author's lower rankings, and his mother collapsing has him rushing to the hospital. He meets An Kohinata at the hospital, and she's confused to see Masamune Takano with him, but she sees the look on Ritsu's face before Takano leaves. An later guesses that he and Takano are together. Ritsu initially tries to deny it, but admits the truth, and An is accepting. Takano overhears them and An tells him not to make Ritsu cry before she leaves. Takano and Ritsu stop by the bookstore and overhear some girls buying Satou's new manga. The go home and have sex. Another day at work, Takano gives Ritsu a training manual he compiled himself. Shouta Kisa warns Ritsu of the intense training to come that they've all suffered.

In "The Case of Ritsu Onodera No.13," it's Ritsu's birthday. Just as Takano tries to make plans for Ritsu's big day, Ryuichiro Isaka announces his flower-viewing party on the same day, and it falls on Ritsu to plan the venue. At the party, Ritsu drinks too much as some young women chat him up. Takano takes Ritsu home, and Ritsu wakes up in Takano's bed. Five minutes before midnight, Takano wishes him happy birthday and they have sex. The next day at work, the women from the party try to get Ritsu to go out for drinks with them, but Takano gets jealous and invites them to join him instead.

"The Case of Ritsu Onodera No.13.5" is a short three-page chapter that takes place during No.13 in the early morning after Ritsu's birthday. Just as Ritsu starts to get out of bed to leave, Takano catches him and convinces him to stay. The next morning, he makes Ritsu breakfast.

Character debuts[]

  • Uehara, a young woman from general affairs who talks to Ritsu at Isaka's party.
  • Mizuno, a young woman who talks to Ritsu at Isaka's party.


Japanese edition[]

English edition[]

International editions[]


Sekai-ichi Hatsukoi manga series

Volume 1

Volume 2

Volume 3

Volume 4

Volume 5

Volume 6

Volume 7

Volume 8

Volume 9

Volume 10

Volume 11

Volume 12

Volume 13

Volume 14

SiH v15.jpg
Volume 15

SiH v16.jpg
Volume 16


  1. 1.0 1.1 1.2 Tweet with sample pages from SuBLime's official Twitter @SuBLimeManga. September 7, 2017.