If you're looking for anime similar to group_inou: HEART, you might like these titles.
Hirosuke is a normal young man who, by accident, meets the most beautiful girl he has ever seen: Ajimu. Although the circumstances of their meeting are awkward and misunderstood, love begins to flourish and all is well; that is, until Hirosuke realizes that there might be more to Ajimu's past that she isn't ready to deal with yet...
Koyama Sachi, a high school girl living in Iwaki City, Fukushima, has been deeply scarred by the Tohoku earthquake of 2011. Since it occurred, she's distanced herself from her friends and family, and shows no interest in people or romance. A violinist since childhood, she's a member of her school's music club and practices every day to prepare for the quartet performance at the school cultural festival. In the midst of all this, she meets Yuusuke, a boy who took refuge in Iwaki after his family was left unable to return home following the great quake, and the two begin to fall in love...
Chiaki and Nodame are in Vienna to meet with Stresemann, but there’s just one problem: the perverted conductor has eluded his agent and fled the country back to Japan! With their plans for the trip officially cancelled, the pair, along with Kiyora, Jean and Yuko, decides to go sightseeing instead. As Kiyora spends more time with the two couples, she begins to miss her own boyfriend, Ryuutaro, and wishes she could see him again. Luckily, the young and energetic violinist has managed to make it to Paris to see Kiyora perform at the latest competition, but how will she fare, and will the pair finally be reunited?
When Yakko Mitamure was young, her mother passed away, leaving Yakko alone with her father. In the present she works at her father’s restaurant and attends evening classes at a university, but her life changes forever when she runs into Hashizo Kato and his macho and pancake-loving cat Juliano. Hashizo’s brother Go is the lead singer of the band Bee Hive, and soon ends up becoming a love interest. However, Yakko also has feelings for Bee Hive’s keyboardist, Satomi. Her heart can only belong to one – a fact that she will soon come to understand as a series of events unfold…