Diamond no Kouzai
The Days of Diamond

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Both are baseball manga where main character has struggle fitting in with the teammates due to some past event. In that sense they are quite psychological as main characters blame themselves for events that have been caused by other people. Ookiku is old series while Diamond is quite new. There is also something about the artstyle, the way characters are drawn that feels similar between those series. If you liked one, you could try checking out the other.