I'd suggest 'Ao Haru Ride'. It shares similarities with 'True Love' in that it explores complex relationships and has a charming art style. The way the characters interact and grow is quite similar too.
You might like 'Kimi ni Todoke'. It shares the theme of building relationships and has a comparable light-hearted yet touching tone like Love Junkies.
I think 'Spirit Away' could be similar. It has elements of supernatural love and a unique art style.
You might like 'Emotional Encounters'. It's similar in that it delves deep into the complexities of love and has a similar artistic tone. The characters' development and story arcs could give you the same kind of enjoyment as 'The Love Doctor'.
One manga that could be similar is 'Watchmen'. It shares elements of dark themes and complex characters like Batman.
One manga that might be similar is 'Parasyte'. It has elements of horror and action, like Gantz, and explores themes of survival and humanity's response to strange threats.
I think 'Fruits Basket' could be similar. It has a similar emotional depth and character-driven storylines like 'Swan'.
I think 'Love Hina' might be somewhat similar. It has elements of romance and character development like in Sextudy.
I think 'School Days' could be somewhat similar. It has similar elements of complex relationships and emotional turmoil.
Well, 'Parasyte' could be a manga similar to Kaijii. Both have elements of horror and mystery, and the character development is quite engaging in both.
It's hard to say exactly. But you might want to check out manga like 'Attack on Titan' as it shares some similarities in terms of intense storylines and complex characters.